CN103590822B - A kind of method that judges stratum formation low-resistance endless belt - Google Patents
A kind of method that judges stratum formation low-resistance endless belt Download PDFInfo
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Abstract
The invention belongs to petroleum exploration and development technical field, relate in particular to a kind of oil-gas reservoir identification method, how to exist by detection data qualitative analysis oil reservoir. Judge that stratum forms a method for low-resistance endless belt, irreducible water saturation Swb and the residual oil saturation Sor value of coring data definite rock core; Obtain the ratio of drilling mud resistivity Rmf and formation water resistivity Rw according to the irreducible water saturation Swb of described rock core and residual oil saturation Sor value; Detection of a target stratum, obtains formation water resistivity Rw and drilling mud resistivity Rmf, and relatively actual physics value Rmf/Rw and calculated value Rmf/Rw size, if actual physics value is greater than calculated value, is judged and formed low-resistance endless belt. The method effectively improves the exploration efficiency of low resistivity hydrocarbon layers for low resistivity hydrocarbon Tian Shangneng, the low resistivity hydrocarbon layers of identification fast directly perceived, reduces exploration cost, increases economic benefit. There are many low resistivity hydrocarbon layers in China, this invention has broad application prospects.
Description
Technical field
The invention belongs to petroleum exploration and development technical field, relate in particular to a kind of oil-gas reservoir identification method, asWhat exists by detection data qualitative analysis oil reservoir.
Background technology
In the technology that judges low resistivity hydrocarbon layers, low-resistance endless belt refers to that flushed zone resistivity in reservoir, transition are chargedResistance rate and virgin zone resistivity, in the minimum situation of intermediate zone resistivity, call low balk ring reservoir intermediate zoneBand. In the time that stratum detecting arrives low-resistance endless belt, illustrate that stratum exists oil gas, this point is already by logging community instituteConfirm, also have people to verify by experiment in mud invaded formation process, invade direction along mud and haveLow-resistance endless belt occurs, " a kind of method of optimizing drilling mud and identifying fast low resistivity hydrocarbon layers " proposed to form lowThe necessary condition of balk ring band, can make stratum form low-resistance endless belt by this patent content.
In oil exploration process, identify low-resistance endless belt, due to the investigation depth difference of array logs, energy conventionallyFind low-resistance endless belt. Low-resistance endless belt is the positive evidence that contains oil gas, therefore can determine by low-resistance endless beltProperty ground judges low resistivity hydrocarbon layers. But because the condition of formation low-resistance endless belt is very strict, do not use the partyWhen method, can not ensure that low-resistance endless belt all can appear in every mouthful of well, in the time not there is low-resistance endless belt, usually causesThe leakage of low resistivity hydrocarbon layers, or utilize other well logging means to cause exploration cost to increase, " a kind of optimization drilling wellMud is identified the method for low resistivity hydrocarbon layers fast " Mud Property method is proposed in patent, can not retouch intuitivelyState mud resistivity and form the relation between low-resistance endless belt condition, therefore prior art is unfavorable for low resistivity hydrocarbonThe exploration and development of layer.
Summary of the invention
In prior art, judgement formation low-resistance endless belt passes through flushed zone resistivity, intermediate zone resistivity and original stateThe research of formation resistivity relation, draws the quantification condition that forms low-resistance endless belt. Judge that physical quantity requires high,Not directly perceived, need to calculate in a large number.
In order to solve technical problem of the prior art, the present invention obtains stratum water power by setting up coordinate systemResistance rate and mud resistivity ratio, use coordinate system not need stronger professional knowledge on the one hand, easy, fastSpeed, make stratum form low-resistance endless belt intuitively, thereby identify fast low resistivity hydrocarbon layers, reduce low resistivity hydrocarbon layersLeakage.
Summary of the invention of the present invention is as follows,
Judge that stratum forms a method for low-resistance endless belt, the Pore structure of coring data definite rock coreDegree Swb and residual oil saturation Sor value; Full according to the irreducible water saturation Swb of described rock core and residual oilObtain the ratio of drilling mud resistivity Rmf and formation water resistivity Rw with degree Sor value; Detection of a target stratum,Obtain formation water resistivity Rw and drilling mud resistivity Rmf, relatively actual physics value Rmf/Rw and calculated valueRmf/Rw size, if actual physics value is greater than calculated value, judges and forms low-resistance endless belt.
Said method comprises,
Step 1, drilling well coring data, and the irreducible water saturation Swb of definite rock core and residual oil saturationSor value; Described rock core irreducible water saturation Swb and residual oil saturation Sor determine by core experiment; ;
Step 2, determines residual oil saturation Sor isopleth according to irreducible water saturation Swb size; Comprise:
Step 21, sets up coordinate system, and abscissa is irreducible water saturation, and ordinate is drilling mud electricityThe ratio of resistance rate Rmf and formation water resistivity Rw.
Step 22, marks one group of residual oil saturation Sor isopleth in coordinate system;
The residual oil saturation that described isopleth is illustrated on this curve equates, according in formulaTwo resistivity ratios and irreducible water saturation, residual oil are saturatedSpend relevant with the actual water saturation in stratum, because stratum water saturation is greater than stratum irreducible water saturation,Make all stratum form low-resistance endless belt, must haveAccording to this formula, first falseIf residual oil saturation is constant, resistivity ratio becomes the relation between irreducible water saturation.
Step 3, determine intersection point: in described coordinate system according to arbitrary irreducible water saturation Swb numerical value describedIntersection point on corresponding residual oil saturation Sor isopleth, is equivalent to look for correspondence on residual oil isoplethIrreducible water saturation intersection point, the ordinate that described intersection point is corresponding is drilling mud resistivity Rmf and formation waterThe ratio size of resistivity Rw, and the corresponding multiple residual oil saturation of each irreducible water saturation, Sor differenceRatio difference;
Step 4, the resistance ratio obtaining according to the formation water resistivity Rw collecting and step 3 determine produce lowThe drilling mud resistivity Rmf that balk ring band is minimum;
Step 5, determining step: the actual well drilled mud resistivity Rmf in the region to be measured collecting is greater than stepIn 4, obtain drilling mud resistivity time, stratum forms low-resistance endless belt.
Whether correct in order to verify after above-mentioned each step, described method also comprises detection verification step, to gatheringThe actual well drilled mud resistivity Rmf arriving and the drilling mud resistivity of calculative determination relatively after, pass through instrumentRegion to be measured is surveyed, obtained resistivity curve, whether checking directly perceived there is low-resistance endless belt.
In concrete, described instrument be array induction or array side to instrument, and record five resistivity curves.
Described array induction or array side are 0.25～3.05M to the investigation depth of instrument, survey low balk ringBand, if exist low-resistance endless belt can judge stratum oil-containing, otherwise not oil-containing of stratum.
The present invention can improve the discrimination of low resistivity hydrocarbon layers, thereby improves the coefficient of mining of low resistitvity reservoir, reducesCost of exploration & development, such as the bad identification of conventional method for low resistivity hydrocarbon layers, need to increase nuclear magnetic resonance and surveyWell project, the expense of every mouthful of well is hundreds of thousands unit, reduces this project by the inventive method, saves exploration expenditure.
Brief description of the drawings
Fig. 1 is the not fluid saturation distribution map before invaded formation of middle drilling mud;
Fig. 2 is the fluid saturation distribution map forming after drilling mud invaded formation;
Fig. 3 is the quantitative coordinate system figure of the formation low-resistance endless belt set up of the present invention.
Wherein, in Fig. 1 and Fig. 2, be 1. mud in well-drilling borehole, be 2. formation fluid saturation dimension, be 3.Hydrocarbon saturation size
Concrete each width accompanying drawing is illustrated in connection with detailed description of the invention
Detailed description of the invention
Low-resistance endless belt is the positive evidence that stratum exists movable hydrocarbon, the mud resistivity obtaining by coordinate system,Judge whether stratum forms low-resistance endless belt, if form low-resistance endless belt in drilling process, illustrate it is an oil gasLayer, otherwise can not be just an oil-gas Layer. The method is effectively improved to low oil resistance for low resistivity hydrocarbon Tian ShangnengThe exploration efficiency of gas-bearing formation, the low resistivity hydrocarbon layers of identification fast directly perceived, reduces exploration cost, increases economic benefit.There are many low resistivity hydrocarbon layers in China, this invention has broad application prospects.
In Fig. 2 2., 3. in formation water saturation degree, hydrocarbon saturation size reduce, due to oil phase, waterPhase permeability varies in size, and the volume that they reduce is also different, 1. replaced by drilling mud and reduce part,In the time that mud resistivity is greater than the certain numerical value of formation water resistivity, make in the depth bounds of certain invaded zoneResistivity is less than flushed zone resistivity and virgin zone resistivity size, thereby presents low-resistance zone phenomenon.
Fig. 3 is the figure that forms low-resistance endless belt, and in figure, curve is irreducible water saturation isopleth, and abscissa is bundleTie up water saturation, ordinate is mud resistivity and formation water resistivity ratio, when the mud electricity of practiceWhen resistance rate and formation water resistivity ratio are greater than the ratio of coordinate system, stratum can form low-resistance endless belt.
In the concrete embodiment of the present invention, low resistivity hydrocarbon layers is that the relative shoulder-bed resistivity (SBR) of reservoir resistivity is lowerOr absolute resistance rate is very low, by conventional resistivity instrument identification difficulty. For achieving the above object,The technological means of taking is in the present invention as follows:
(1) determine irreducible water saturation Swb and the residual oil saturation of rock core by this drilling and coring delivery dataSor, %; (2) the formation water data obtaining according to this block is determined formation water resistivity Rw, Ω M; (3)Determine residual oil saturation Sor isopleth in figure according to irreducible water saturation Swb size; (4) according in figureThe intersection point of determining irreducible water saturation Swb size and residual oil saturation Sor isopleth, this intersection point is correspondingOrdinate is the ratio size of drilling mud resistivity Rmf and formation water resistivity Rw; (5) according to formation waterResistivity Rw determines needed drilling mud resistivity Rmf, when the mud resistivity of actual well drilled is greater than figureWhen the mud resistivity of middle calculating, stratum can form low-resistance endless belt; (6) by array induction or array side toInstrument records five resistivity curves, and investigation depth is that 0.25～3.05M surveys low-resistance endless belt, if existLow-resistance endless belt can judge stratum oil-containing, otherwise not oil-containing of stratum.
Example one: old liberated area identification low resistivity hydrocarbon layers
Certain well is in exploration old block, and deep investigation resistivity value is very low, and resistivity value is less than 1.5 Ω m,Resistivity is low is because high salinity causes, is the low resistivity hydrocarbon layers of the typical high salinity origin cause of formation. Rock core bundleTiing up water saturation is 31.6%, and residual oil saturation is 20%, and formation water analysis report shows that water type is calcium chloride,Total salinity 154232mg/L, being converted to formation water resistivity is 0.034 Ω m. Find out satisfied according to plateThe condition that forms low-resistance endless belt is Rmf/Rw> 5.5, actual well drilled mud resistivity is 0.45 Ω m, mudResistivity RmfWith formation water resistivity RwBetween satisfied relation be: Rmf/Rw=13.2 > 5.5, meet far awayForm the condition of low-resistance endless belt. Therefore will inevitably there is low-resistance endless belt in this well in the time of well logging, in fact by battle arrayRow induction data is processed and is judged and show that stratum original state resistivity is 1.7 Ω m, and intermediate zone resistivity is 1.1 Ω m,Flushed zone resistivity is 7.8 Ω m, and intermediate zone resistivity is minimum, illustrates that stratum has formed low-resistance endless belt. LogicalCross formation testing and confirmed stratum oil-containing, formation testing day 1.5 tons of production fluids, wherein 0.5 ton of day produce oil, moisture 68.5%,1503.1 tons of total production fluids, 557.1 tons of tired oily produce oils.
Embodiment 2: low resistivity hydrocarbon layers is found in new district
Certain well reservoir resistivity value, lower than the resistivity value of upper and lower country rock, is to belong to the relative shoulder-bed resistivity (SBR) of resistivityLower low resistivity hydrocarbon layers, oil-water-layer identification difficulty is large, and this layer is not made any judgement before this. By battle arrayThe parameter induction loggings such as the high frequency in row inductions show, flushed zone resistivity is 10 Ω m, and formation resistivity is8 Ω m, flushed zone resistivity is greater than formation resistivity invades for increasing resistance, is not oil-containing on ordinary meaningLayer, but invaded zone resistivity is 6.5 Ω m, and invaded zone resistivity is minimum, illustrates that stratum has formed low balk ringBand, contains oil gas in reservoir, and comprehensive analysis and judgement are oil-water common-layer. Confirm after tested stratum oil-containing, daily outputOil is 10t, moisture 57%. The discovery of this oil-gas Layer has been found a new oil-bearing layer at this block.
Claims (6)
1. judge that stratum forms a method for low-resistance endless belt, it is characterized in that, coring data definite rock coreIrreducible water saturation Swb and residual oil saturation Sor; According to the irreducible water saturation Swb of described rock core and residualExcess oil saturation degree Sor obtains the ratio of drilling mud resistivity Rmf and formation water resistivity Rw; The detection of a targetStratum, obtains formation water resistivity Rw and drilling mud resistivity Rmf, relatively actual physics value Rmf/Rw withCalculated value Rmf/Rw size, if actual physics value is greater than calculated value, judges and forms low-resistance endless belt;
Described method comprises,
Step 1, drilling well coring data, and the irreducible water saturation Swb of definite rock core and residual oil saturationSor; Described rock core irreducible water saturation Swb and residual oil saturation Sor determine by core experiment;
Step 2, determines residual oil saturation Sor isopleth according to irreducible water saturation Swb size; Comprise:
Step 21, sets up coordinate system, and abscissa is irreducible water saturation, and ordinate is drilling mud electricityThe ratio of resistance rate Rmf and formation water resistivity Rw;
Step 22, marks one group of residual oil saturation Sor isopleth in coordinate system, according toSuppose that residual oil saturation is constant, resistivity ratio become with irreducible water saturation itBetween relation, make described one group of residual oil saturation Sor isopleth;
Step 3, determine intersection point: in described coordinate system according to arbitrary irreducible water saturation Swb numerical value relativelyIntersection point on the described residual oil saturation Sor isopleth of answering, the ordinate that described intersection point is corresponding is drilling well mudThe ratio size of slurry resistivity Rmf and formation water resistivity Rw;
Step 4, the drilling mud resistivity Rmf obtaining according to the formation water resistivity Rw collecting and step 3Determine and produce the minimum drilling mud resistivity Rmf of low-resistance endless belt with the ratio of formation water resistivity Rw;
Step 5, determining step: the actual well drilled mud resistivity Rmf in the region to be measured collecting is greater than stepIn 4, obtain drilling mud resistivity time, stratum forms low-resistance endless belt.
2. a kind ofly according to claim 1 judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described method also comprises detection verification step, to the actual well drilled mud resistivity Rmf and the calculating that collectDefinite drilling mud resistivity relatively after, by instrument, region to be measured is surveyed, obtain resistivity songLine, whether checking directly perceived there is low-resistance endless belt.
3. a kind ofly according to claim 2 judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described instrument is array induction instrument, and records five resistivity curves.
4. a kind ofly according to claim 3 judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
The investigation depth of described array induction instrument is 0.25～3.05M, surveys low-resistance endless belt, if there is low-resistanceEndless belt can judge stratum oil-containing, otherwise not oil-containing of stratum.
5. a kind ofly according to claim 2 judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described instrument be array side to instrument, and record five resistivity curves.
6. a kind ofly according to claim 5 judge that stratum forms the method for low-resistance endless belt, it is characterized in that,
Described array side is 0.25～3.05M to the investigation depth of instrument, surveys low-resistance endless belt, if there is low-resistanceEndless belt can judge stratum oil-containing, otherwise not oil-containing of stratum.
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| CN112711076B (en) * | 2019-10-25 | 2023-08-22 | 中国石油天然气股份有限公司 | Method and apparatus for extracting depth of penetration of mud into formation in petroleum drilling |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435977A (en) * | 1982-01-18 | 1984-03-13 | Mobil Oil Corporation | Method for locating low resistivity pay sands using well logs |
| US4529878A (en) * | 1982-09-24 | 1985-07-16 | Shell Oil Company | Determination of residual oil saturation using thermal neutron decay measurements without knowledge of the formation or formation fluids |
| US5379216A (en) * | 1992-05-27 | 1995-01-03 | Schlumberger Technology Corporation | Method and apparatus for producing a new output record medium illustrating a quantitative description in the volume dimension of mud filtrate invasion into permeable zones of a formation in a wellbore |
| CN1766284A (en) * | 2005-11-29 | 2006-05-03 | 大庆石油管理局 | Stratum pressure recognition method by abnormal fluid immersing into well bore |
| WO2009058980A2 (en) * | 2007-11-02 | 2009-05-07 | Schlumberger Canada Limited | Formation testing and evaluation using localized injection |
| CN101899972A (en) * | 2010-06-30 | 2010-12-01 | 中国石油大学(北京) | Establishment method of physical model capable of forecasting waterflood development of sandstone reservoirs |
| CN102518428A (en) * | 2011-11-11 | 2012-06-27 | 中国石油天然气股份有限公司 | Oil-water layer identification method and device |
-
2012
- 2012-08-16 CN CN201210293217.7A patent/CN103590822B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435977A (en) * | 1982-01-18 | 1984-03-13 | Mobil Oil Corporation | Method for locating low resistivity pay sands using well logs |
| US4529878A (en) * | 1982-09-24 | 1985-07-16 | Shell Oil Company | Determination of residual oil saturation using thermal neutron decay measurements without knowledge of the formation or formation fluids |
| US5379216A (en) * | 1992-05-27 | 1995-01-03 | Schlumberger Technology Corporation | Method and apparatus for producing a new output record medium illustrating a quantitative description in the volume dimension of mud filtrate invasion into permeable zones of a formation in a wellbore |
| CN1766284A (en) * | 2005-11-29 | 2006-05-03 | 大庆石油管理局 | Stratum pressure recognition method by abnormal fluid immersing into well bore |
| WO2009058980A2 (en) * | 2007-11-02 | 2009-05-07 | Schlumberger Canada Limited | Formation testing and evaluation using localized injection |
| CN101899972A (en) * | 2010-06-30 | 2010-12-01 | 中国石油大学(北京) | Establishment method of physical model capable of forecasting waterflood development of sandstone reservoirs |
| CN102518428A (en) * | 2011-11-11 | 2012-06-27 | 中国石油天然气股份有限公司 | Oil-water layer identification method and device |
Non-Patent Citations (2)
| Title |
|---|
| X油田低阻油气层综合评价方法与技术研究;范炜等;《国外测井技术》;20100430;51-54 * |
| 低阻环带的形成机理初探;董经利等;《石油仪器》;20091231;第23卷(第6期);47-49 * |
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