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Method for judging and identifying structure damaged type ancient oil reservoirs

A paleo-reservoir and structure technology, applied in the field of oil and gas exploration, can solve problems such as the inability to obtain the cause and process, and the inability to quantitatively characterize the formation conditions of paleo-reservoirs, and achieve the effects of low identification cost, wide application, and simple operation

Active Publication Date: 2019-09-17
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, most of these methods use the forward modeling method to identify paleo-reservoirs through phenomena, but their causes and processes cannot be obtained, let alone quantitatively characterize the formation conditions of paleo-reservoirs, and usually require a large number of experiments to complete

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  • Method for judging and identifying structure damaged type ancient oil reservoirs
  • Method for judging and identifying structure damaged type ancient oil reservoirs
  • Method for judging and identifying structure damaged type ancient oil reservoirs

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Embodiment 1

[0085] Taking the DL1 area of ​​a fault depression in the Songliao Basin as the research area, the Cretaceous strata are mainly developed in the research area, which are respectively from bottom to top: Shahezi Formation (K 1 sh), Yingcheng Group (K 1 yc), Denglouku group (K 1 d), Quantou group (K 1 q), Qingshankou Formation (K 2 qn), Yao family group (K 2 y) and Nenjiang Formation (K 2 n) etc. Exploration results show that oil and gas are distributed from the Shahezi Formation to the Quantou Formation, of which the Quantou Formation and Yingcheng Formation are the main oil and gas-bearing intervals. According to the analysis of oil and gas accumulation conditions, there are two sets of regional mudstone caprocks developed in the DL1 area, which are respectively located in the third member of Ying and the second member of Quanquan. Since paleo-reservoirs can be developed in the study area, it depends on the sealability of the mudstone caprock of the third member of Ying,...

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Abstract

The invention provides a method for judging and identifying structure damaged type ancient oil reservoirs, and belongs to the technical field of oil and gas exploration. Starting from the causes of the ancient oil reservoirs, vertical storage conditions of oil and gas are determined by evaluating fault-caprock configuration relationships in different periods, and further formation positions of the ancient oil reservoirs are identified. The method comprises the following steps: in a target layer of a research area, selecting a plurality of measuring points uniformly covering a fault in a research area range; calculating a fault mudstone ratio lower limit value SGRlim corresponding to each measuring point according to logging, drilling and seismic data of the research area; according to the logging, drilling and seismic data of the research area, calculating a reservoir-forming-stage fault mudstone ratio SGR(ancient) corresponding to each measuring point; calculating a current fault mudstone ratio SGR(current) corresponding to each measuring point according to the logging data of the research area; and when the SGR(ancient) corresponding to each measuring point is greater than the SGRlim and the SGR(current) is less than the SGRlim, indicating that the ancient oil reservoirs exist at the measuring point.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, in particular to a method for identifying structurally damaged ancient oil reservoirs. Background technique [0002] There are two main failure mechanisms for ancient oil reservoirs. One is that after the formation of the oil reservoir in the early stage, due to the continuous subsidence of the stratum in the later stage, the crude oil cracked and generated gas at high temperature, thus destroying the original oil reservoir; The destructive effect of oil reservoirs is destroyed, escape along faults or fractures, or migrate to the surface, or migrate to shallow parts to form secondary oil and gas reservoirs. [0003] At present, the identification methods of ancient oil reservoirs mainly include core observation method, reservoir asphalt and fluid inclusion observation method, GOI method, formation salinity method, crude oil physical property method and other oil and gas migration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/40G06F17/50
CPCG01V1/306G01V1/40G06F2119/06G06F30/20
Inventor 宋明水范婕林会喜李国栋秦峰高剑雄周涛宫亚军牛靖靖周惠莲
Owner CHINA PETROLEUM & CHEM CORP
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