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四川盆地碳酸盐岩领域在油气勘探中占主导地位,近年中石油和中石化在四川深层碳酸盐岩领域勘探中均取得了重要进展,针对川西坳陷中段前期碳酸盐岩领域勘探和研究工作较少,本文通过成藏地质条件生、储、盖、圈闭、保存等的研究,认为该区发育5套烃源岩;中三叠统雷口坡组一—三段、下三叠统嘉陵江组二—三段、下三叠统飞仙关组三段、上二叠统长兴组和下二叠统茅口组及栖霞组储层发育;除山前通天断裂附近和下三叠统膏岩层系剥蚀区外,保存条件均较好;海相发育众多局部构造,并成带分布,具备形成大中型气田的条件。结合海相层系潜力评价和成藏模式预测,认为该领域勘探潜力巨大,是川西增储上产的潜在领域。并结合勘探中面临的问题,提出针对山前带和前山带应搞好造山带复杂地表深层的地震采集、处理、解释攻关,重在落实圈闭;针对孝新合-丰谷构造带坚持立体勘探,有必要在该区构造和岩相叠合有利部位部署一口风险勘探井。
Carbonate rocks in Sichuan Basin dominate oil and gas exploration. In recent years, both PetroChina and Sinopec have made significant progress in the exploration of deep carbonate rocks in Sichuan. In response to the exploration and research work on carbonate rocks in the middle of the western Sichuan depression In this study, we found that there are 5 sets of source rocks in the area through the study of the geologic conditions of hydrocarbon accumulation, storage, cap, trapping and preservation. In the Middle Triassic Leikoupo Formation, The second and third sections of the Jialingjiang Formation, the third section of the Lower Triassic Feixianguan Formation, the Upper Permian Changxing Formation and the Lower Permian Maokou Formation and the Qixia Formation have been developed. Except for the vicinity of the Piedmont fault and the Lower Triassic Gypsum layer denudation zone, the preservation conditions are better; marine development of many local structures, and into a belt distribution, with the formation of large and medium-sized gas field conditions. Combined with the potential evaluation of marine strata and the prediction of reservoir forming model, the exploration potential in this area is considered to be a potential area for increasing production and increasing production in western Sichuan. Combining with the problems in the exploration, the author proposed that the deep-seated seismic acquisition, processing and interpretation of the orogenic belt should be carried out for the foreland belt and the former mountain belt, focusing on the implementation of traps. For the purpose of xiao xinhe-Fenggu structural belt, Exploration, it is necessary to deploy a risk exploration well in the favorable tectonics and superimposition facies of the area.