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Method for calculating fault activity frequency based on lithologic pair difference value

A calculation method and a technology of activity frequency, applied in the field of oil and gas exploration, can solve problems such as poor economic benefits of drilling

Pending Publication Date: 2021-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN104110243A discloses a "Method for Developing Adjacent Small Fault Blocks in Combination Plane Using Cross-Fault-Block Horizontal Wells", which solves the problem of poor economic benefits of drilling in a single remaining oil-enriched area on a complex small fault-block plane

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  • Method for calculating fault activity frequency based on lithologic pair difference value
  • Method for calculating fault activity frequency based on lithologic pair difference value
  • Method for calculating fault activity frequency based on lithologic pair difference value

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Experimental program
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Effect test

Embodiment 1

[0029] The fault activity frequency calculation method based on the lithological pair difference includes the following steps:

[0030] (1) Select the drilling wells X1 and X2 in the upper and lower walls of the adjacent fault, and select the marker layer to calculate the fault distance H;

[0031] (2) Divide the lithological combinations of wells X1 and X2 in the target layer into lithological pairs whose bottom is sandstone and overlying mudstone, count the number of lithological pairs on the upper and lower walls of the fault, and record them as S1 and S2;

[0032] (3) Using the formula Z=H / (S2-S1) as the calculation formula, where Z is the fault activity, and bringing the results of steps (1) and (2) into the calculation formula to obtain the fault activity characterization result.

Embodiment 2

[0034] The calculation method of fault activity frequency based on the difference of lithology pairs includes: based on the drilling lithology data of adjacent faults; analyzing the characteristics of fault episodic activities and their influence on the lithology development of sedimentary strata; taking the number of lithology pairs as a fault Activity is calculated based on.

[0035] The lithology data translates into bottom sandstone, overlying mudstone lithology pairs.

[0036] The lithology data of Minghuazhen Formation include well location, top and bottom depths, and lithology of drilling on fault upwelling and downthrowing faults.

[0037] The sandstone-mudstone lithology combination of the ascending wall and descending wall of strata faults during the accumulation period is attributed to a lithology pair, and the occurrence times of the lithology pair are summed respectively, which are recorded as S1 and S2;

[0038] Taking Z=H / (S2-S1) as the calculation formula, whe...

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Abstract

The invention discloses a method for calculating a fault activity frequency based on a lithologic pair difference value and belongs to the technical field of oil-gas exploration. The method comprises the following steps that: (1) drilling wells X1 and X2 close to an ascending wall and a descending wall of a fault are selected, and a marker bed is selected to count a fault displacement H; (2) the lithology combination of the drilling wells X1 and X2 in a target stratum are divided into lithology pairs of which the bottoms are sandstone and of which the overlying is mudstone, and the number of the lithology pairs of the ascending wall and the number of the lithology pairs of the descending wall of the fault are calculated and are recorded as S1 and S2 respectively; and (3) a formula that Z = H / (S2-S1) is used as a calculation formula, wherein Z is fault activity, the results of the step (1) and the step (2) are substituted into the calculation formula, and a fault activity characterization result is obtained. According to the method, on the basis of drilling lithologic data close to the fault, the characteristics of the curtain type activity of the fault and the influence of the curtain type activity on lithologic development of a sedimentary stratum are considered, the number of the lithologic pairs serves as the calculation basis of the activity of the fault, the characteristics of multiple activities of the fault are better manifested, and the evaluation result of the activities of the fault is closer to the reality.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, in particular to a fault activity frequency calculation method based on lithology pair difference. Background technique [0002] A fault is a structure formed by a significant relative displacement of the rock blocks on both sides along the fracture surface due to the fracture of the earth's crust. Fault activity directly affects the vertical distribution of oil and gas during the accumulation period, so accurate research on fault activity is conducive to clarifying the spatial distribution of oil and gas, and provides a useful reference for the next step of drilling control. [0003] At present, researchers at home and abroad use different indicators to analyze fault activity, mainly including fault throw, ancient drop, and fault activity rate. The above indicators are only based on the perspective of fault distance and deposition time of the target layer, without taking into ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 罗霞王宇张云涛韩宏伟张云银邹东波孙兴刚
Owner CHINA PETROLEUM & CHEM CORP