Analysis of gas resource potential of Sinian and Cambrian in the eastern Sichuan Basin

doi:10.3969/j.issn.1672-7703.2018.04.003

Abstract

Abstract: The characteristics of Sinian-Cambrian source rocks were analyzed comprehensively by using drilling and outcrop data etc. The results show that the source rocks in Doushantuo Formation and Qiongzhusi Formation have mainly Type I organic matter, average TOC of 1.38% and 1.29%, and average R_o of 2.5% and 2.22% respectively, and are both in high-over mature stage. Based on the thermal evolution index of Well Chi7, the Baker-R_o model was determined to be suitable for R_o history simulation. Through experimental test and comparison study, the hydrocarbon generation rate curve and organic carbon restoration coefficient were corrected, and the gas migration & accumulation factor of the eastern Sichuan Basin was determined at 0.4%. Then, the basin simulation was carried out. It is found that:(1) the quantity of gas generated by the pre-salt source rocks in the eastern Sichuan Basin is 192.54×10¹²m³, and the gas resources are 7701×10⁸m³; and (2) the Datianchi-Shuangjiaba-Mingyuexia structural belt in the south of Kaijiang-Xuanhan paleo-uplift, and the Fangdoushan-Dachigan structural belt in the east of the eastern Sichuan Basin are on the direction of oil and gas migration, where the pre-salt Cambrian Longwangmiao Formation and Sinian Dengying Formation are favorable exploration strata.

Key words: resource potential, Doushantuo Formation, Qiongzhusi Formation, source rock, basin simulation, eastern Sichuan Basin

CLC Number:

Ren Hongjia, Guo Qiulin, Zhou Gang, Wu Xiaozhi, Xie Hongbing, Zheng Man, Meng Jingfeng. Analysis of gas resource potential of Sinian and Cambrian in the eastern Sichuan Basin[J]. China Petroleum Exploration, 2018, 23(4): 21-29.

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