川东地区震旦系—寒武系天然气资源潜力分析

doi:10.3969/j.issn.1672-7703.2018.04.003

摘要/Abstract

摘要： 通过钻井、野外露头等资料，综合分析川东地区震旦系—寒武系烃源岩特征，揭示陡山沱组和筇竹寺组烃源岩有机质类型以I型为主，TOC平均值分别为1.38%和1.29%，R_o平均值分别为2.5%和2.22%，均处于高—过成熟阶段。以池7井的热演化指标作为刻度，确定Baker-R_o模型适合于R_o史模拟。通过实验测试及对比研究，修正产烃率和有机碳恢复系数等关键参数，确定川东地区天然气运聚系数为0.4%。以此为基础，开展盆地模拟，得到：①川东盐下烃源岩生气量为192.54×10¹²m³，天然气资源量为7701×10⁸m³；②开江—宣汉古隆起南部的大天池—双家坝—明月峡构造带及川东东部的方斗山—大池干构造带为油气的重要指向区，构造带盐下的寒武系龙王庙组和震旦系灯影组储层为有利的勘探层系。

关键词: 资源潜力, 陡山沱组, 筇竹寺组, 烃源岩, 盆地模拟, 川东地区

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

中图分类号:

任洪佳, 郭秋麟, 周刚, 吴晓智, 谢红兵, 郑曼, 孟靖丰. 川东地区震旦系—寒武系天然气资源潜力分析[J]. 中国石油勘探, 2018, 23(4): 21-29.

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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