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内蒙古西部额济纳旗及其邻区石炭系-二叠系油气地质条件初探
引用本文:卢进才,魏仙样,魏建设,李玉宏.内蒙古西部额济纳旗及其邻区石炭系-二叠系油气地质条件初探[J].地质通报,2010,29(2).
作者姓名:卢进才  魏仙样  魏建设  李玉宏
作者单位:中国地质调查局西安地质调查中心,陕西,西安,710054
基金项目:中国地质调查局地质调查项目,西北地区中小盆地群油气资源远景调查项目
摘    要:在对额济纳旗及其邻区石炭系-二叠系的分布特征、岩性特征和沉积环境进行初步研究的基础上,通过对烃源岩展布、有机质丰度和热演化史的研究,结合储、盖务件与保存条件评价,总结了区内石炭系-二叠系油气地质条件.区内残留了厚数千米的上石炭统-上二叠统,岩性组合为碎屑岩+碳酸盐岩+火山岩,反映了裂谷型盆地的沉积特征.广泛发育的浅海陆棚相泥页岩具有较好的生烃条件,以Ⅱ-Ⅲ类干酪根为主,TOC含量中等,R_0一般为0.79%~1.08%,烃源岩演化以成熟为主,部分剖面受构造动力作用的影响达到过成熟.受盆地沉积与演化的控制,区内发育滨岸相砂砾岩、台地斜坡相生物碎屑灰岩、火山碎屑岩(或火山角砾岩)、火山熔岩、风化壳等多种类型的储集层.广泛分布的白垩系为良好的区域盖层,主要成烃期之后的构造作用以坳陷沉降或挤压抬升为主,有利于油气系统的保存.获得了一些与石炭系-二叠系烃源岩有关的油气赋存的信息,显示区内石炭系-二叠系具有良好的油气资源前景.

关 键 词:内蒙古  额济纳旗及邻区  石炭系-二叠系  烃源岩  储集层  残留厚度  油气地质条件

Petroleum geological conditions of Carboniferous- Permian in Ejina Banner and its vicinities,western Inner Mongolia, China
LU Jin-cai,WEI Xian-yang,WEI Jian-she,LI Yu-hong.Petroleum geological conditions of Carboniferous- Permian in Ejina Banner and its vicinities,western Inner Mongolia, China[J].Geologcal Bulletin OF China,2010,29(2).
Authors:LU Jin-cai  WEI Xian-yang  WEI Jian-she  LI Yu-hong
Abstract:Based on preliminary study of distribution, lithologic features and sedimentary environment of Carboniferous- Permian inEjina Banner and its vicinity, the paper mainly take studies on distribution of source rocks, organic matter abundance and thermal evolution history, combining with the evaluation of reservoir, cap and preservation conditions, then the authors summarize the Carboniferous- Permian petroleum geological conditions of the study area. There is several meters remnant in thickness of Upper Carboniferous-Upper Permian in this area, the lithologic association is clastic rocks- carbonate rock- volcanic rock, which shows the sedimentary characteristics of rift basin. The shale of neritic shelf fades is widely developed in this area, and the shale has good hydrocarbon generation conditions, the Kerogen type is dominated by Ⅱ- Ⅲ type, middle content of organic carbon, general vitrinite reflectance ranging from 0.79% to 1.08%. The evolution level of hydrocarbon source rocks is mature, which of some seismics is overmature, becauseof the effect of the tectonic dynamics. Controlled by the sedimentary and evolution of basin, there are several types of reservoir, including shoreside glutenite, platform slope bioclastic limestone, pyroclastic rock (volcanic breccia), volcanic lava, and weathering crust.Cretaceous widely distributed is good regional cap, and tectonism after the main hydrocarbon-generating stage were mainly depression-sedimentation, extrusion and uplift, which was benefit for hydrocarbon preservation. And also gain the hydrocarbon occurrenceinformation related with Carboniferous- Permian source socks, this shows that there is good prospects for hydrocarbon resources.
Keywords:Inner Mongolia  Ejina Banner and its vicinity  Carboniferous- Permian  hydrocarbon source rocks  reservoir  remnantthickness  petroleum geological conditions
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