CN112576246B - Prediction method for low-order fault in offshore complex fault block oil field - Google Patents
Prediction method for low-order fault in offshore complex fault block oil field Download PDFInfo
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- CN112576246B CN112576246B CN202011458455.XA CN202011458455A CN112576246B CN 112576246 B CN112576246 B CN 112576246B CN 202011458455 A CN202011458455 A CN 202011458455A CN 112576246 B CN112576246 B CN 112576246B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000011161 development Methods 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- 238000011835 investigation Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 abstract description 14
- 239000007924 injection Substances 0.000 abstract description 14
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/001—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells specially adapted for underwater installations
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Abstract
The invention discloses a prediction method of a low-order fault in an offshore complex fault block oil field, which comprises the following steps: determining the relation between the low-order fault and the high-order fault mode according to the oilfield structural stress background and the high-order fault combined mode, and further establishing a low-order fault development mode; determining the breakpoint position on a plane according to the low-order fault development mode and outcrop investigation data; determining low-order fault analysis seismic attribute reaction characteristics according to real drilling data, and establishing a relationship between the low-order fault and the seismic attribute through seismic attribute forward analysis; and judging the trend and combination of the low-order faults according to the relation between the low-order faults and the seismic attribute and the production dynamic data, and describing the trend and combination of the low-order faults by combining the breakpoint positions. The method starts from the low-order fault formation mechanism, synthesizes the acquired data, predicts the low-order fault, and has very important guiding significance for the deployment of the oil field internal injection well network and the establishment of the injection and production relation.
Description
Technical Field
The invention belongs to the field of petroleum exploration and development, and particularly relates to a prediction method of low-order faults in an offshore complex fault block oil field.
Background
The low-order fault refers to a tiny fault with a fault distance smaller than 10m and an extension length of 100m, and is associated with a high-order fault. For the middle and later stages of the development of the complex fault block oil field, the low-order fault becomes a key factor for restricting the injection and production establishment, and the development effect of the oil field is affected. The current drilling and geophysical prospecting technical means mainly aim at the recognition and description of high-order faults, but are difficult to predict and describe for low-order faults.
At present, by means of drilling and geophysical prospecting, high-order fault description and characterization are mature, but low-order fault description and characterization are still world-level problems, geophysical prospecting response characteristics are weak and difficult to detect, and a research area is influenced by air clouds, so that the difficulty of recognition is further increased. In addition, the existence of a low-order fault at a certain point underground can be confirmed by drilling, but the azimuth and the spread of the low-order fault outside the well point cannot be known, the cost is extremely high, and the average single-well drilling cost of the offshore oil field is 3000-5000 ten thousand yuan. Further advances in methods and means depending on geophysical prospecting techniques in the future are still not possible to describe and characterize in the current art.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a prediction method for low-order faults in an offshore complex fault block oil field.
The technical scheme provided by the invention for solving the technical problems is as follows: a prediction method for low-order faults in an offshore complex fault block oil field comprises the following steps:
determining the relation between the low-order fault and the high-order fault mode according to the oilfield structural stress background and the high-order fault combined mode, and further establishing a low-order fault development mode;
determining the breakpoint position on a plane according to the low-order fault development mode and outcrop investigation data;
determining low-order fault analysis seismic attribute reaction characteristics according to real drilling data, and establishing a relationship between the low-order fault and the seismic attribute through seismic attribute forward analysis;
and judging the trend and combination of the low-order faults according to the relation between the low-order faults and the seismic attribute and the production dynamic data, and describing the trend and combination of the low-order faults by combining the breakpoint positions.
The further technical scheme is that the relation between the low-order fault and the high-order fault mode is determined according to the oilfield structural stress background and the high-order fault combined mode, and the establishment of the low-order fault development mode comprises the following steps:
determining the stress relation between internal fault blocks and faults of the oil field according to the background and the regional structural stress of the oil field;
and determining a low-order fault development mode according to the stress relation among fault blocks and faults in the oil field and the high-order fault combination mode.
The invention has the beneficial effects that:
1. the cost is low; the available data, especially the structural stress analysis, the real drilling and the production dynamic data comprehensive analysis, are utilized to qualitatively predict the low-order fault development mode on the basis of not increasing the data;
2. the application is strong; guiding the deployment of the injection well based on the predicted low-order fault development mode;
3. the success rate is high; by means of low-order fault prediction, deploying and implementing 14 wells in a complex-structure area, wherein 10 wells establish injection-production relation, and the success rate reaches 70%;
4. the benefit is high; in order to predict an injection and production well implemented before a low-order-level fault, the injection and production are not effective, the production well is in failure development, the average daily oil production is 20 times per day in the survival period, the injection and production relationship is established after the low-order-level fault is predicted, the survival period of the production well is increased by 1 time, and the average daily oil production is increased to 40 times per day;
5. the popularization is strong; the method can be used for reference in the middle and later stages of the development of the complex fault block oil field, wherein the structural stress, the drilling, the production dynamic and the geophysical prospecting data are all conventional data and are easy to obtain.
Drawings
FIG. 1 is a complex fault block oilfield plot of an embodiment.
Detailed Description
The invention will be further described with reference to examples and figures.
The invention discloses a prediction method of a low-order fault in an offshore complex fault block oil field, which comprises the following steps of:
step S10, firstly, collecting related data of a low-order fault area which is drilled by a target oil field or a peripheral similar oil field inner well;
s20, developing stress mechanism and characteristic research generated by the low-order faults based on collected data, and analyzing and summarizing the relation between the low-order faults and the high-order fault combination modes so as to establish a low-order fault development mode;
s30, combining transverse comparison recognition of the directional well, and determining the breakpoint position on the plane;
step S40, revealing low-order fault analysis seismic attribute response characteristics by means of drilling data, capturing weak information change, establishing a relation between the low-order fault and the seismic attribute through seismic forward analysis, and describing the low-order fault trend and combination by combining the breakpoint recognized on the well through the auxiliary discrimination of the low-order fault trend and combination of the sections in different directions; meanwhile, the azimuth, the injection and production response relation and the production characteristics of the injection and production well in the low-order fault development area are referred to for judgment.
Wherein the related data includes stress background, advanced fault pattern, drilling data, electrical data, geophysical prospecting data, and peripheral production dynamics.
Examples
The research area is a complex fault block oil field (shown in figure 1), and develops a near east-west forward fault and a north-south sliding fault under the action of regional tensile stress. And (3) combining the oilfield structural stress background and the high-order fault development mode, analyzing and researching the existence of 1 type of local tensile stress in the region, for example, a right-handed sliding fault superposition region in a black frame, and analyzing and predicting a development gray fault combination mode. A group of northeast prone positive faults are developed through well drilling, no response relation between injection and production wells is implemented, and meanwhile, seismic forward modeling and fault section investigation are consistent with objective knowledge. The injection and production wells are implemented in gray frames based on the knowledge, so that the fault existence is confirmed, and the injection and production relationship is established.
The method starts from the low-order fault formation mechanism, synthesizes the acquired data, predicts the low-order fault, and has very important guiding significance for the deployment of the oil field internal injection well network and the establishment of the injection and production relation; meanwhile, the method has the advantages of low cost, short period, quick response, strong error correction and the like, and is verified to be perfect by using real drilling in practice; before the problem of low-order fault characterization cannot be solved by a geophysical prospecting means, an effective low-order fault recognition and prediction method is found, and the middle-stage and later-stage efficient development of the complex fault block oil field is effectively guided.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any person skilled in the art can make some changes or modifications to the equivalent embodiments without departing from the scope of the technical solution of the present invention, but any simple modification, equivalent changes and modifications to the above-mentioned embodiments according to the technical substance of the present invention are still within the scope of the technical solution of the present invention.
Claims (1)
1. A prediction method for low-order faults in an offshore complex fault block oil field is characterized by comprising the following steps:
determining a relation between a low-order fault and a high-order fault mode according to an oilfield structural stress background and a high-order fault combined mode, and further establishing a low-order fault development mode, wherein the method comprises the following steps of:
determining the stress relation between internal fault blocks and faults of the oil field according to the background and the regional structural stress of the oil field;
determining a low-order fault development mode according to the stress relation between fault blocks and faults in the oil field and the high-order fault combination mode;
determining the breakpoint position on a plane according to the low-order fault development mode and outcrop investigation data;
determining low-order fault analysis seismic attribute reaction characteristics according to real drilling data, and establishing a relationship between the low-order fault and the seismic attribute through seismic attribute forward analysis;
and judging the trend and combination of the low-order faults according to the relation between the low-order faults and the seismic attribute and the production dynamic data, and describing the trend and combination of the low-order faults by combining the breakpoint positions.
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Citations (4)
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|---|---|---|---|---|
| CN105629297A (en) * | 2014-11-07 | 2016-06-01 | 中国石油化工股份有限公司 | Method for predicting micro fault distribution rules of complex fault-block oilfields |
| CN106291715A (en) * | 2016-09-24 | 2017-01-04 | 中国地质大学（北京） | A kind of low-grade fault law of development Forecasting Methodology based on fracture Self-similarity Theory |
| CN106291755A (en) * | 2016-10-05 | 2017-01-04 | 中国地质大学（北京） | A kind of Long Sheng district low-grade fault law of development quantitative forecasting technique |
| CN110424955A (en) * | 2019-06-19 | 2019-11-08 | 中国石油化工股份有限公司 | A kind of complex fault block inside Tapping Potential Method |
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- 2020-12-11 CN CN202011458455.XA patent/CN112576246B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629297A (en) * | 2014-11-07 | 2016-06-01 | 中国石油化工股份有限公司 | Method for predicting micro fault distribution rules of complex fault-block oilfields |
| CN106291715A (en) * | 2016-09-24 | 2017-01-04 | 中国地质大学（北京） | A kind of low-grade fault law of development Forecasting Methodology based on fracture Self-similarity Theory |
| CN106291755A (en) * | 2016-10-05 | 2017-01-04 | 中国地质大学（北京） | A kind of Long Sheng district low-grade fault law of development quantitative forecasting technique |
| CN110424955A (en) * | 2019-06-19 | 2019-11-08 | 中国石油化工股份有限公司 | A kind of complex fault block inside Tapping Potential Method |
Non-Patent Citations (2)
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