台内鲕粒滩气藏成藏过程与模式——以川东北河坝地区下三叠统飞仙关组三段为例

发布时间：2019-05-10 14:09

【摘要】：结合区域沉积埋藏史和构造演化史,对川东北河坝地区下三叠统飞仙关组三段台内鲕粒滩灰岩气藏的气体来源、成藏期次和成藏过程进行研究。根据单体烃碳同位素测试结果判断气源主要来自下伏上二叠统吴家坪组(或龙潭组)。流体包裹体均一温度分析表明飞三段经历了多期油气生成运移活动,主要集中在晚侏罗世—早白垩世,与上二叠统烃源岩的生气高峰相匹配,代表了主要成藏期。河坝地区构造在印支期形成雏形,侏罗纪—早白垩世为相对稳定阶段,晚白垩世燕山晚期是构造形成的主要阶段,新生代喜马拉雅期为构造复杂化阶段。预测沉积微古地貌高地、断裂或裂缝相对发育区和古今构造发育区为川东北地区台内滩鲕粒灰岩气藏发育有利区。
[Abstract]:Combined with the history of regional sedimentary burial and tectonic evolution, the gas source, reservoir forming period and reservoir forming process of oolitic beach limestone gas reservoir in the third member of Feixianguan formation of Lower Triassic in Heba area, northeast Sichuan, are studied. According to the carbon isotope test results of single hydrocarbon, it is concluded that the gas source mainly comes from Wujiaping formation (or Longtan formation) of Upper Permian. The homogenization temperature analysis of fluid inclusions shows that the third member of Fei has experienced multiple stages of oil and gas generation and migration, mainly concentrated in the late Jurassic to early Cretaceous, which matches with the gas peak of Upper Permian hydrocarbon source rocks and represents the main accumulation period. The structure of Heba area was formed in the Indosinian period, the Jurassic-early Cretaceous stage was relatively stable, the late Yanshanian stage of late Cretaceous was the main stage of tectonic formation, and the Cenozoic Himalayan stage was the stage of structural complication. It is predicted that the sedimentary micropaleogeomorphological highlands, the relative development area of faults or fractures and the ancient and modern tectonic development areas are favorable areas for the development of oolitic limestone gas reservoirs in the inner beach of Northeast Sichuan.
【作者单位】：中国石化石油勘探开发研究院;中国石化海相油气藏开发重点实验室;
【基金】：国家科技重大专项(2011ZX05005-002)
【分类号】：P618.13

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