天然气工业2018，Vol.38Issue(5)：1-16,16.DOI:10.3787/j.issn.1000-0976.2018.05.001
四川盆地二叠系烃源岩及其天然气勘探潜力(一)——烃源岩空间分布特征
The Permian source rocks in the Sichuan Basin and its natural gas exploration potential (Part 1): Spatial distribution of source rocks
摘要
Abstract
The Permian–Middle-Lower Triassic strata belong to the major gas payzones in the Sichuan Basin. Natural gas in many large and medium-sized gas fields discovered is derived from the Permian source rocks, but the main types an spatial distribution of which, so far, however, have not been understood systematically and completely. In this paper, fine geochemical calibration was conducted on the horizons of Permian source rocks in typical wells/sections of the Sichuan Basin. Then, the types and spatial distribution of the Permian source rocks were analyzed using well drilling and logging data. The following results were obtained. First, in the Sichuan Basin, two sets of source rocks (i.e., the Middle Permian carbonate rocks and the Upper Permian mudstone rocks) are developed in the Permian, and the Upper Permian Dalong Fm marine mudstone source rocks are locally developed. Second, the mudstone source rocks of Longtan Fm, Upper Permian, are characterized by large thickness, high organic matter abundance and wide distribution in the whole basin, and it is the most important set of source rocks in the Permian. The Longtan Fm mudstone source rocks are 80-140 m thick in the Cangxi–Yunyang area in the northern Sichuan Basin, 60-100 m thick in the Chengdu–Chongqing–Luzhou area in the southern Sichuan Basin, and 40-80 m thick in central Sichuan Basin. Third, the Longtan Fm coal is also an important source rock in the Sichuan Basin. It is 5-15 m thick in the Nanchong–Qijiang–Luzhou area in the central–SE Sichuan Basin and 2-5 m thick in the NE Sichuan Basin. Fourth, the Upper Permian Changxing Fm source rocks are poorly developed, while the Dalong Fm source rocks are distributed with a thickness of 5-25 m in the Kaijiang–Guangyuan area in the northern Sichuan Basin, acting as important source rocks in the northern Sichuan Basin. Fifth, the Middle Permian carbonate source rocks are widely distributed in the whole Sichuan Basin, acting as secondary source rocks in the Permian, and their thickness is 50-150 m in the NE and SE Sichuan Basin and generally less than 50 m in other areas.关键词
四川盆地/二叠纪/龙潭组/大隆组/烃源岩类型/空间分布/泥岩/碳酸盐岩/煤Key words
Sichuan Basin/Permian/Longtan Fm/Dalong Fm/Type of source rocks/Spatial distribution/Mudstone/Carbonate rock/Coal引用本文复制引用
陈建平,李伟,倪云燕,梁狄刚,邓春萍,边立曾..四川盆地二叠系烃源岩及其天然气勘探潜力(一)——烃源岩空间分布特征[J].天然气工业,2018,38(5):1-16,16.基金项目
中国石油天然气股份有限公司科研项目"地质条件下油气排驱机理与应用研究" (编号:2016A-202) （编号:2016A-202）
"四川盆地天然气资源潜力分析及新区新领域勘探目标评价" (编号:2016E-0601) （编号:2016E-0601）
中国石油化工股份有限公司科研项目"南方复杂构造区有效烃源岩评价研究" (编号:2004-08). （编号:2004-08）
