川西前陆盆地流体的跨层流动和天然气爆发式成藏

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。     

龙门山中段推覆体内流体包裹体特征

采用流体包裹体研究和地质研究相结合的方法，研究了龙门山茂汶推覆体和彭灌推覆体内流体特征，讨论了盆山间流体的温度，盐度变化规律和流体可能的流动方向。研究表明推覆体内流体的均一温度为101．9－226℃，压力为13．5－18．0MPa，密度为0．91－1．14g/cm^3。从茂汶推覆体至彭灌推覆体，流体的盐度具有增高、温度总体有降低特征；靠近造山带一侧的盆地内流体，其盐度和温度明显低于造山带内推覆体中的流体。在推覆体内部，从推覆体前锋到主滑面流体的均一温度逐渐降低。断层是流体运移的主要通道，盆山间流体有运移和热交换，盆地流体有可能通过滑动面被带入造山带内部。     

浅析构造混杂带的类型及组成特征——以滇西兔峨幅、弥沙井幅1∶5万区调为例

在滇西1∶5万区域地质调查中,首次在该地区对构造混杂带进行了较为详细的调查和研究,基本查明了图区内构造混杂带的空间分布、内部组成及变形特征,使图幅质量大大提高,同时也使该地区的基础地质工作取得了突破性进展。     

兰坪盆地侏罗纪陆相层序地层研究

陆相盆地与海相盆地 (尤其是陆棚海盆地 )的沉积充填具有着不同的主控因素 ,构造的控制作用在陆相盆地中尤为重要。陆相盆地的层序地层划分依据为构造作用的转化面划分为构造层序 ,构造层序内部依据沉积充填样式的差异进一步划分出层序。兰坪盆地的侏罗系共划分出一个构造层序和 3个层序     

滇-黔-桂地区右江盆地流体流动与成矿作用

对右江盆地及其周缘地区金、砷、锑、汞低温矿床的C,H,O,S,Sr同位素、同位素年代学、流体的常量、微量稀土元素地球化学等的综合研究表明,成矿流体为富含矿质的盆地流体,燕山晚期大规模的同源流体流动引起了大面积的低温成矿作用和硅化。在盆地和台地间,成矿流体由盆地流向台地;在盆地内部,流体由台间盆地流向孤立台地。同沉积断裂和古岩溶面是流体垂向和侧向流动的主要通道。     

黔西南晴隆锑矿区萤石的稀土元素地球化学特征

对与辉锑矿共生萤石的稀土元素地球化学特征研究表明，所有萤石均具有Ce负异常，其稀土配分模式存在3种类型：Eu弱亏损型、Eu正常型、Eu富集型。从成矿早期至晚期，萤石的稀土配分从Eu弱亏损型向富集型演化，稀土总量逐渐降低，并由中稀土富集向轻稀土富集演化。成矿流体可能主要属于盆地流体，具有十分低的稀土总量，在成矿作用过程中，成矿流体由早期的还原条件转化为晚期的氮化条件，由中稀土富集向轻稀土富集演化。     

滇-黔-桂地区右江盆地流体流动与成矿作用

对右江盆地及其周缘地区金、砷、锑、汞低温矿床的C,H,O,S,Sr同位素、同位素年代学、流体的常量、微量稀土元素地球化学等的综合研究表明,成矿流体为富含矿质的盆地流体,燕山晚期大规模的同源流体流动引起了大面积的低温成矿作用和硅化.在盆地和台地间,成矿流体由盆地流向台地;在盆地内部,流体由台间盆地流向孤立台地,同沉积断裂和古岩溶面是流体垂向和侧向流动的主要通道.     

生物标志化合物在黔西南晴隆锑矿床成因分析中的应用

来自相同有机母源的有机物具有相同的生物标志化合物组成特征,被誉为“地球化学化石”或“生物分子化石”,被广泛应用于油气勘探,但在固体矿产方面的应用并不多见。通过对黔西南晴隆锑矿床中与锑矿密切共生的萤石进行有机包裹体生物标志化合物特征分析,与相邻的右江盆地进行生物标志化合物特征对比,认为晴隆锑矿床的成矿流体来源于右江盆地上二叠统邻好组,经古岩溶面横向运移至晴隆聚集成矿,成因为燕山期热液充填交代成矿。     

Paleo-temperature Evolution and Water Soluble Gas in Sinian Reservoir,Anpingdian-Gaoshiti Structural Zone,Central Sichuan Basin

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.     

Energy Field Adjustment and Hydrocarbon Phase Evolution in Sinian-Lower Paleozoic,Sichuan Basin

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.