The research and application of the reservoir controlling mechanism for the No.2 Fracture Zone, Weixi’nan Sag

Chen Kui; Zhou Jiaxiong; Zhang Hui; Li Mao; Jiang Zhandong; Sun Xiaohui; Pan Zhifeng; Li Chunning

doi:10.3969/j.issn.0253-4193.2019.07.008

Volume 41 Issue 7

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Chen Kui，Zhou Jiaxiong，Zhang Hui, et al. The research and application of the reservoir controlling mechanism for the No.2 Fracture Zone, Weixi’nan Sag[J]. Haiyang Xuebao，2019, 41(7)：92–102，doi:10.3969/j.issn.0253−4193.2019.07.008

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The research and application of the reservoir controlling mechanism for the No.2 Fracture Zone, Weixi’nan Sag

doi: 10.3969/j.issn.0253-4193.2019.07.008

1.
Zhanjiang Branch, CNOOC China Limited, Zhanjiang 524057, China
2.
Reserves Office, CNOOC China Limited, Beijing 100010, China

Received Date: 2019-01-23
Rev Recd Date: 2019-04-04

Available Online: 2021-04-21

Publish Date: 2019-07-25

Abstract

Abstract

The Weixi’nan Sag is the important research area of exploration and development integration. This study takes the Weizhou Formation of the No.2 Fracture Zone as the research object. By analyzing the geometry, kinematics, and dynamics characteristics of fracture, the "slope-flat" fault system in the middle section and the "shovel-type" fault system on both sides are divided into the level 3 en-echelon main fracture zone, the level 4 branch fracture zone, and the level 5 branch fracture zone. The "slope-flat" fault system in the middle section is subjected to higher in-situ stress, and the main and branch faults are more developed. The vast majority of oil and gas are distributed in the "slope-flat" fault system. A comprehensive analysis of the relationship between the internal fracture system of the differential fault system in the No.2 Fracture Zone and the oil-gas distribution law is made, and obtains the corresponding regular of 3 aspects of fracture reservoir controlling mechanism and 8 types of fracture reservoir controlling patterns. Under the regular of fracture reservoir controlling mechanism and patterns, the search and evaluation of targets are carried out around the inner or surrounding oil fields of the No.2 Fracture Zone, and good results are obtained. Based on the field production, the potential targets of North 1, North 3 and North 4 in the middle part of the No.2 Fracture Zone are searched and optimized. The three blocks have been successfully drilled, and the purpose of the geological reservoir has been achieved. The regular of fracture reservoir controlling mechanism and patterns which have been applied to the potential zone of the No.2 Fracture Zone in the southwest depression play very good effect.
- Weixi’nan Sag,
- structural trap,
- fracture system,
- oil and gas distribution,
- fracture reservoir controlling mechanism

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