Great discovery and significance of natural gas exploration in deep to ultra-deep formation in eastern tidal zone of Liaohe Depression

doi:10.3969/j.issn.1672-7703.2023.02.003

Abstract

Abstract: With the increasing degree of exploration and development, “whether breakthroughs can be achieved in deep to ultra-deep formation” has become an important scientific issue affecting the stable development of mature oil fields in eastern China. It is particularly prominent in Liaohe Oilfield due to the small mining rights area, and extremely difficult in Liaohe Depression because of its narrow lake basin and poor data quality. The regional tectonic evolution is analyzed and hydrocarbon-generating kinetics and hydrocarbon accumulation dynamics are researched to identify the mechanisms of basin formation, hydrocarbon generation and accumulation in eastern tidal zone of Liaohe Depression. The study results show that: (1) Controlled by the dustpan structure of the protype lake basin, the main source rocks were characterized by “great burial depth, large thickness and wide distribution area”; (2) Two genetic types of mature-highly mature gas, i.e.,kerogen pyrolysis type and crude oil cracking type, were developed in deep formation, showing great resource potential; (3) An independent “fluid sealing box” was developed in deep to ultra-deep formation by the coupling of two factors of multi-set argillaceous rocks in the sedimentary filling sequence and the early strike-slip shear faults, forming two types of hydrocarbon accumulation modes, namely selfgeneration and self-storage type and side-generation and side-storage type, which had favorable geological conditions for the formation of medium to large-scale gas reservoir. A major breakthrough has been achieved in risk exploration well Kuitan 1, which provide significant practical and hydrocarbon accumulation theory guidance to further deepen the exploration of deep to ultra-deep formation in Liaohe Depression and even fault basins.

CLC Number:

TE122.2

Hu Yingjie, Cai Guogang, Liu Xingzhou, Zhou Yan, Xie Baoguo, Yang Guangda, Guo Ping, Zhang Dongwei, Wong Wensheng, Wang Weicheng, Zou Bingfang, Cui Xiangdong. Great discovery and significance of natural gas exploration in deep to ultra-deep formation in eastern tidal zone of Liaohe Depression[J]. China Petroleum Exploration, 2023, 28(2): 24-34.

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