地质通报2018，Vol.37Issue(5)：930-937,8.
致密砂岩中多期碳酸盐胶结物形成机理——以鄂尔多斯盆地华庆地区三叠系延长组长63为例
The formation mechanism of multi-stage carbonate cements in tight sandstone: A case study of Chang 63 sub-member of Triassic Yanchang Formation in Huaqing area,Ordos Basin
摘要
Abstract
In order to understand tight sandstone characteristics and formation mechanism,the authors analyzed the distribution and formation mechanism of carbonate cements in terms of petrological and geochemical characteristics of the samples by means of casting thin sections,cathodoluminescence and scanning electron microscopy in the samples,take the Chang 63 sub-member reservoir of Triassic Yanchang Formation in Huaqing area of Ordos Basin as the study object.The result shows that the main types of carbonate minerals are calcite,ferrocalcite,dolomite and ferrodolomite,and different areas show great difference in type distribution,being higher in content in southwest and lower in northeast.The content and type are related to the provenance and the source of calcium ions in aqueous medium,which can be divided into authigenic carbonate and exogenous carbonate.As the pore volume was plugged up by the carbonate cement on a large scale and the later dissolution was lacking,the sandstone of Chang 63 sub-member of Yanchang Formation became densified.On the basis of drawing the contour map of ferrocalcite and ferrodolomite cement in study area,the mechanism of carbonate cements was investigated.It is held that the carbonate cements were mainly formed by the dissolution-reprecipitation of carbonate rock debris and feldspar dissolution-precipitation.The results obtained by the authors can provide reference for fa-vorable prediction of tight oil of Yanchang Formation in Huaqing area,and can also provide reference for microscopic characteristics study of tight hydrocarbon reservoir both in China and abroad.关键词
碳酸盐/多期次/形成机理/致密砂岩/鄂尔多斯/华庆地区/延长组Key words
carbonate cements/multi-stages/formation mechanism/tight sandstone/Ordos Basin/Huaqing area/Yanchang Formation分类
天文与地球科学引用本文复制引用
庞军刚,国吉安,杨友运,东玉,尚晓庆,王桂成,李谦..致密砂岩中多期碳酸盐胶结物形成机理——以鄂尔多斯盆地华庆地区三叠系延长组长63为例[J].地质通报,2018,37(5):930-937,8.基金项目
国家科技重大专项《大型油气田及煤层气开发》(编号:2016ZX05050006)、西安石油大学“沉积学与储层地质学”科研创新团队(编号:2013KYCXTD03)、陕西省教育厅专项科学研究计划《鄂尔多斯盆地南部上古生界物源分析及砂体展布规律研究》(编号:17JK0605)和中国地质调查局项目《鄂尔多斯周缘盆地群油气基础地质调查》(编号:121201011000150014) （编号:2016ZX05050006）
