CN112576246A - Method for predicting low-order fault in offshore complex fault block oil field - Google Patents
Method for predicting low-order fault in offshore complex fault block oil field Download PDFInfo
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Abstract
The invention discloses a method for predicting a low-order fault in an offshore complex fault block oil field, which comprises the following steps: determining the relation between a low-order fault and a high-order fault mode according to the oil field structural stress background and the high-order fault combined mode, and further establishing a low-order fault development mode; determining the position of a breakpoint on a plane according to a low-order fault development mode and outcrop survey data; determining seismic attribute response characteristics of low-order fault analysis according to real well drilling data, and establishing a relation between the low-order fault and seismic attributes through seismic attribute forward analysis; and judging the trend and the combination of the low-order fault according to the relation between the low-order fault and the seismic attribute and the production dynamic data, and describing the trend and the combination of the low-order fault by combining the breakpoint position. The method starts from the low-order fault formation mechanism, synthesizes acquirable data, realizes the prediction of the low-order fault, and has very important guiding significance for the deployment of the injection-production well pattern in the oil field and the establishment of the injection-production relationship.
Description
Technical Field
The invention belongs to the field of petroleum exploration and development, and particularly relates to a method for predicting a low-order fault in an offshore complex fault block oil field.
Background
The low-order fault refers to a fault distance less than 10m and an extension length of 100m, and is a micro fault accompanied 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 establishment of injection and production, and the development effect of the oil field is influenced. The current drilling and geophysical exploration 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, high-order fault description and characterization are mature depending on drilling and geophysical prospecting means, but low-order fault description and characterization are still a world-level difficult problem, geophysical prospecting response characteristics are weak and difficult to detect, and a research area is influenced by gas cloud, so that the difficulty of recognition is further increased. In addition, the existence of a low-order fault at a certain point in the underground can be confirmed by relying on drilling, but the position and the distribution of the low-order fault outside a well point cannot be known, the cost is extremely high, and the average single-well drilling cost of an offshore oil field is 3000-5000 ten thousand yuan. In the future, the technology still cannot realize the description and the drawing of the geophysical prospecting technology by depending on the progress of the geophysical prospecting technology method and means.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for predicting a low-order fault in an offshore complex fault block oil field.
The technical scheme provided by the invention for solving the technical problems is as follows: a method for predicting low-order faults in an offshore complex fault block oil field comprises the following steps:
determining the relation between a low-order fault and a high-order fault mode according to the oil field structural stress background and the high-order fault combined mode, and further establishing a low-order fault development mode;
determining the position of a breakpoint on a plane according to a low-order fault development mode and outcrop survey data;
determining seismic attribute response characteristics of low-order fault analysis according to real well drilling data, and establishing a relation between the low-order fault and seismic attributes through seismic attribute forward analysis;
and judging the trend and the combination of the low-order fault according to the relation between the low-order fault and the seismic attribute and the production dynamic data, and describing the trend and the combination of the low-order fault by combining the breakpoint position.
The further technical scheme is that the relation between the low-order fault and the high-order fault mode is determined according to the structural stress background of the oil field and the high-order fault combined mode, and then the establishment of the low-order fault development mode comprises the following steps:
determining the stress relation between fault blocks and fault in the oil field according to the oil field structural stress background and the regional structural stress;
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; by utilizing the available data, particularly structural stress analysis, actual drilling and production dynamic data comprehensive analysis, the low-order fault development mode can be qualitatively predicted on the basis of not increasing the data;
2. the application type is strong; guiding the deployment of injection and production wells based on the predicted low-order fault development mode;
3. the success rate is high; deploying and implementing 14 wells in a complex construction area by means of low-order fault prediction, wherein injection-production relations are established among 10 wells, and the success rate reaches 70%;
4. the benefit is high; in order to predict the injection and production wells implemented before the low-order fault, the injection and production are not effective, the production wells are developed in failure, the average daily oil production is 20 days in the survival period, the injection and production relation is established after the low-order fault is predicted, the survival period of the production wells is increased by 1 time, and the average daily oil production is increased to 40 days;
5. the popularization is strong; the method can be used for reference in the middle and later stages of complex fault block oilfield development, wherein structural stress, drilling, production dynamics and geophysical prospecting data are conventional data and are easy to obtain.
Drawings
FIG. 1 is a diagram of a complex fault block field of an embodiment.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
The invention discloses a method for predicting a low-order fault in an offshore complex fault block oil field, which comprises the following steps of:
s10, collecting the relative data of the low-order fault zone drilled by the inner well of the target oil field or the similar oil field;
s20, developing stress mechanism and characteristic research generated by the low-order fault based on the collected data, analyzing and summarizing the relation between the low-order fault and the high-order fault combined mode, and further establishing a low-order fault development mode;
step S30, determining the position of a breakpoint on a plane by combining the lateral contrast knowledge of the directional well;
s40, revealing low-order fault analysis seismic attribute response characteristics by means of well drilling data, capturing weak information changes, establishing a relation between low-order faults and seismic attributes through seismic forward modeling analysis, judging the trend and combination of the low-order faults in an auxiliary mode through sections in different directions, and describing the trend and combination of the low-order faults by combining well-recognized breakpoints; meanwhile, the direction of injection and production wells in the low-order fault development area, injection and production response relation and production characteristics are referred to for judgment.
Wherein the related data includes stress background, high-order fault combination mode, drilling data, electrical data, geophysical data and peripheral production dynamic data.
Examples
The research area is a complex fault block oil field (as shown in figure 1), and near east-west forward faults and north-south slip faults are developed under the action of regional tensile stress. And analyzing the existence of 1 type of local tensile stress in the research area by combining the structural stress background of the oil field and the high-order fault development mode, for example, analyzing and predicting the development gray fault combination mode by using a right-handed sliding fault superposition area in a black frame. The well drilling proves that a group of normal faults inclined to the northeast are developed, no response relation between injection wells and extraction wells is implemented, and meanwhile, the earthquake forward modeling and fault profile survey accord with objective knowledge. And (3) implementing injection and production wells in the gray frame based on the knowledge, not only confirming the existence of the fault, but also establishing injection and production relations.
The method starts from the low-order fault formation cause mechanism, synthesizes acquirable data, realizes the prediction of the low-order fault, and has very important guiding significance for the deployment of the injection-production well pattern in the oil field and the establishment of the injection-production relationship; meanwhile, the method has the advantages of low cost, short period, quick response, strong error correction and the like, and is proved and continuously perfected by using real drilling in practice; before the problem of low-order fault description cannot be solved by geophysical prospecting means, an effective low-order fault recognition and prediction method is found, and the middle and later periods of high-efficiency development of the complex fault block oil field are effectively guided.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (2)
1. A method for predicting a low-order fault in an offshore complex fault block oil field is characterized by comprising the following steps:
determining the relation between a low-order fault and a high-order fault mode according to the oil field structural stress background and the high-order fault combined mode, and further establishing a low-order fault development mode;
determining the position of a breakpoint on a plane according to a low-order fault development mode and outcrop survey data;
determining seismic attribute response characteristics of low-order fault analysis according to real well drilling data, and establishing a relation between the low-order fault and seismic attributes through seismic attribute forward analysis;
and judging the trend and the combination of the low-order fault according to the relation between the low-order fault and the seismic attribute and the production dynamic data, and describing the trend and the combination of the low-order fault by combining the breakpoint position.
2. The method for predicting the low-order fault in the offshore complex fault block oilfield according to claim 1, wherein 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 combination mode, and the establishing of the low-order fault development mode comprises the following steps:
determining the stress relation between fault blocks and fault in the oil field according to the oil field structural stress background and the regional structural stress;
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.
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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 |
| 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 |
| 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 |
| 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)
| Title |
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| 束宁凯;宋力;汪新文;: "基于地震正演与井震结合的低序级断层描述技术及应用", 现代地质, no. 02 * |
| 杨锃;: "低序级断层综合识别技术在浩西油田的应用", 江汉石油职工大学学报, no. 02 * |
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