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龙门山因其关键的构造位置和典型的前陆冲断构造,历来受到国内外学者的广泛关注。由于其冲断推覆构造发育,地壳内存在多层次的推覆滑脱构造带,形成了良好的流体运移和聚集场所。而流体是盆山物质交换的最主要介质,与盆地内油气及金属矿床的形成分布密切相关。龙门山冲断带特殊的构造位置,多期次的构造活 相似文献
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Energy Field Adjustment and Hydrocarbon Phase Evolution in Sinian-Lower Paleozoic,Sichuan Basin 总被引：5，自引：0，他引：5
The Sinian-Lower Paleozoic (also called the lower association) in Sichuan (四川) basin has undergone geologic evolution for several hundred million years.The subsidence history of the Sinian-Lower Paleozoic can be divided into four stages:the stable subsidence during Cambrian and Silurian; the uplift and denudation during Devonian and Carboniferous; the subsidence (main process)during Permian to Late Cretaceous; and the rapid uplift and denudation since Late Cretaceous.The later two stages could be regarded as critical factors for the development of oil and gas in the lower association.The evolution of energy field such as temperature,pressure,and hydrocarbon phase in the lower association during the deep burial and uplift in the third stage might be induced as follows:(1)super-high pressure was developed during oil-cracking,previous super-high pressure was sustained,or changed as normal pressure during late uplift; (2) temperature increased with deep burial during persistent subsidence and decreased during uplift in late stage; (3) as a response to the change of the energy field,hydrocarbon phase experienced a series of changes such as organic material (solid),oil (liquid),oil-cracking gas (gaseous) + bitumen (solid) + abnormal high pressure,gas cap gas with super-high pressure (gaseous) + bitumen (solid) + water soluble gas (liquid),and gas in pool (gaseous) + water soluble gas (liquid) + bitumen (solid).The restoration of hydrocarbon phase evolution is of important value for the exploration of natural gas in the Sinian-Lower Paleozoic in Sichuan basin. 相似文献
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The paleo-temperature evolution of Sinian reservoir of Anping (安平) 1 well was rebuilt by taking the method of apatite fission track and Easy%Ro model.The result of apatite fission track determines the accurate burial history and overcomes the flaw that the vitrinite reflectance is taken as paleo-temperature indicator simply.The authors used the laser Raman technique to analyze the methane present in the calcite and quartz fluid inclusions of Sinian reservoir,finding that the methane is water soluble gas.The authors also simulated the paleo-pressure of fluid inclusion by using PVTsim software and finally worked out the methane solubility in water. 相似文献
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文章讨论了龙门山中段前山带的横向构造特征和纵向构造变形层次,并从构造演化角度重点分析了大圆包隐伏构造的油气赋存条件.研究表明,本区构造变形始于印支期,止于喜马拉雅晚期,主要发育浅层次脆性变形的推覆构造、以彭灌飞来峰群为代表的滑覆构造以及滑脱构造.大圆包构造为推覆体之下的隐伏构造圈闭,印支期-燕山早期隆起带上的正向古构造圈闭是早期油气聚集的关键,晚期构造裂缝改善了超致密砂岩的储集条件,生储盖组合良好,具有较好的油气勘探前景. 相似文献
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川西前陆盆地是我国西部典型的前陆盆地,也是我国重要的致密砂岩含气区。盆地上三叠统须家河组二段和四段等渗透层中的流体跨过须家河组三段、五段等不渗透层流入侏罗系自流井组、千佛岩组、沙溪庙组、遂宁组和蓬莱镇组等渗透层,即发生了流体的跨层流动。流体的跨层流动一方面使侏罗系砂岩发生了受酸性水控制的次生溶蚀作用,从而改善了侏罗系的储集条件;另一方面为侏罗系形成天然气藏提供了气源条件。盆地天然气成藏具有烟囱效应、早聚晚藏和异常高压等特征。深盆气是天然气早期聚集在川西前陆盆地上三叠统(主要是须二段和须四段)的基本形式,是后期天然气成藏的基础,本文称之为气库区。天然气藏形成是由地壳隆升作用致使早期聚集的气库区决口,引起流体跨层流动,天然气以速度快、规模大和范围窄的形式运移和聚集,本文称之为爆发式成藏。爆发式成藏形成了上三叠统晚期裂缝重组气藏和侏罗系气藏(并非都是次生气藏)两类气藏。早期天然气聚集和定位地区的确定和评价是今后川西前陆盆地天然气勘探的重点和难点。 相似文献