Main Controlling Factors of Natural Gas Differential Accumulation Model, in Baodao Sag, Qiongdongnan Basin

被引：1
|
作者：
Gan J. [1 ]
Zhang Y. [1 ]
Lin L. [1 ]
Liang G. [1 ]
Li X. [1 ]
机构：
[1] Hainan Branch of CNOOC Ltd., Haikou
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 02期
关键词：
atypical fault depression; gas differential accumulation; main controlling factors of play; petroleum geology; play model; transform fault terrace belts;
D O I：
10.3799/dqkx.2022.456
中图分类号：
学科分类号：
摘要：
The distribution of source‐rock and main controlling factors of gas accumulation are vague in baodao sag, which restricts exploration breakthroughs. Comprehensive application of structural analysis、hydrocarbon source identification, source‐sink system and comprehensive analysis techniques for accumulation, the main hydrocarbon supply kitchen、favorable reservoir‐seal layer as well as main controlling factors of play under the control of differential structural evolution in baodao sag have been identified. The research shows that baodao sag belongs an“atypical”double fault during early oligocene, Yacheng formation in the fault terrace belts is thick, respectively forming two depression groups in the south and north; the northern depression groups mainly controlled by the early NE trending faults, result in multiple transition fault terrace belts are formed; NE‐trending structural transition belts and low uplift controls the distribution of paleogene fan delta, delta sandstone as well as terrigenous marine source rock, thus becomes the main place for natural gas accumulation. Based on the analysis of natural gas migration and accumulation conditions under the control of different tectonic styles, two accumulation models are established, namely“oligocene near ‐ source high efficiency accumulation type in transition fault terrace belts”and“miocene submarine fan limited accumulation type in depression zone”, and sug“oligocene delta & structural ‐ lithologic composite trap”on the transform fault terrace belts t are exploration direction of large gas fields. © 2023 China University of Geosciences. All rights reserved.
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页码：439 / 450
页数：11
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