Important discovery in Well Pengtan 1 in the second member of the Dengying Formation in the Sichuan Basin and its significance

doi:10.3969/j.issn.1672-7703.2020.03.001

Abstract

Abstract: Well Pengtan 1 is a risk exploration well located in the Deyang-Anyue rift in the Sichuan Basin, with the Sinian Dengying Formation as the main target layer. Its objective is to explore the reservoirs and gas-bearing properties of the Dengying Formation in the main hydrocarbon kitchen area in the rift. Based on drilling data from Well Pengtan 1, combined with seismic data, this paper analyzes the stratigraphic and sedimentary sequence in Well Pengtan 1, discusses the controlling factors of the distribution of platform margin mound-beach facies in the 2nd member of Dengying Formation (hereinafter Deng-2 member) in the rift, and indicates the most favorable area for the next stage of exploration. The research results show that: ① The stratigraphic sequence of the Dengying Formation in the northern part of the Deyang-Anyue rift is characterized by the fact that the 4th member of Dengying Formation (hereinafter Deng-4 member) is missing in that area, and by the disconformity between the 3rd member of Dengying Formation (hereinafter Deng-3 member) and the Maidiping Formation of the Lower Cambrian. ② In the Deyang-Anyue rift, mound-beach bodies controlled by synsedimentary faults are developed in the Deng-2 member, as well as microbial carbonate rocks. ③ The lithology of reservoir in the Deng-2 member is mainly algal dolarenite and algal thrombolite dolomite. Dissolution vugs are well developed and the reservoir physical properties are good. ④ The gas-bearing properties of the Deng-2 member are good. According to well logging interpretation, the thickness of the gas layer is 119.26 m, and gas-water contact is at 5550 m. According to research, several rows of platform margin mound-beach belts controlled by fault terrace are developed in the Deng-2 member in the rift, which is in direct contact with the hydrocarbon source rocks of the Cambrian Qiongzhusi Formation. The conditions for near-source hydrocarbon accumulation are favorable. It is therefore an important field for large-scale exploration. On May 4, 2020, natural gas of 121.98×104 m3/d was tested in Deng-2 member from well Pengtan 1, which shows great exploration potential.

Key words: Deyang-Anyue rift, the second member of the Dengying Formation, fault-controlled platform margin belt, synsedimentary fault, structural-lithologic gas reservoir

CLC Number:

Zhao Luzi, Wang Zecheng, Yang Yu, Duan Shufu, Wei Guoqi, Luo Bing, Wen Long, Ma Shiyu, Feng Qingfu, Liu Jingjiang, Sun Xiping, Xie Wuren. Important discovery in Well Pengtan 1 in the second member of the Dengying Formation in the Sichuan Basin and its significance[J]. China Petroleum Exploration, 2020, 25(3): 1-12.

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