| 魏千盛.苏里格西部致密砂岩气藏储层成岩作用特征及孔隙度定量演化[J].地质与勘探,2021,57(2):439-449 |
| 苏里格西部致密砂岩气藏储层成岩作用特征及孔隙度定量演化 |
| Diagenesis and porosity evolution of tight sandstone gas reservoirs in the western Sulige area, Ordos Basin |
| 投稿时间：2020-08-20 修订日期：2021-01-08 |
| DOI：10.12134/j.dzykt.2021.02.019 |
| 中文关键词: 致密砂岩气 孔隙演化 成岩作用 成岩相 苏里格西部 苏48区 鄂尔多斯盆地 |
| 英文关键词: tight sandstone gas, pore evolution, diagenesis, diagenetic facies,Su48 area,western Sulige area,Ordos Basin |
| 基金项目:国家自然科学基金青年科学基金项目“深水相高杂基对致密砂岩微观孔喉结构及渗流能力影响评价”（编号：41802140）和“十三五”国家油气重大专项“鄂尔多斯盆地致密油资源潜力、甜点预测与关键技术应用”（编号：2016ZX05046）联合资助 |
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| 中文摘要: |
| 为了探究鄂尔多斯盆地苏里格西部地区储层致密成因及孔隙演化规律，本文基于铸体薄片、电镜分析和高压压汞等室内测试，通过建立理论计算模型，对其苏48区储层的孔隙演化进行定性分析与量化表征。分析结果表明，区内盒8段储层岩性主要为石英砂岩和岩屑石英砂岩，储层成岩阶段处于早成岩和中成岩阶段，部分达到晚成岩期，成岩作用顺序依次为：压实-硅质胶结-绿泥石胶结-黏土矿物胶结-溶蚀溶解-碳酸盐胶结；量化结果显示：压实作用和胶结作用是造成储层孔隙度下降的主要因素，其中压实作用使得原始孔隙度下降22%，胶结作用使其下降9.81%，溶蚀作用对储集空间有所改善，增加了3.88%的孔隙，最终形成了当今平均孔隙度为7.47%的致密砂岩储层。据理论计算与实测物性数据进行对比，计算结果与实测结果基本吻合，相对误差小于3%。根据成岩作用的作用强度，结合岩石特征分析，可将研究区盒8段储层成岩相划分出4种，即弱-中胶结强溶蚀相、中胶结中溶蚀相、中溶蚀强胶结相和强压实致密相。综合试气成果可知，弱-中胶结强溶蚀相区域气产量较为可观，可将弱-中胶结强溶蚀相区域作为天然气持续上产的主要研究区域。 |
| 英文摘要: |
| The purpose of this work was to explore the genesis of tight reservoirs and porosity evolution in the western Sulige area, Ordos Basin. Based on laboratory tests including observation of casting thin sections, electron microscope analysis and high pressure mercury injection, a theoretical calculation model was established, by which qualitative and quantitative analyses were made to the pore evolution of the gas reservoirs in the Su 48 area. The analysis results show that the reservoir lithology of He 8 member is mainly quartz sandstone and lithic quartz sandstone. The generation of the reservoirs was mostly in the early and middle diagenesis stage, and some reached the late diagenesis stage. The diagenesis sequence was as follows: compaction-siliceous cementation-chlorite cementation-clay mineral cementation-dissolution-carbonate cementation. The quantitative results show that compaction and cementation were the primary factors leading to the decrease of reservoir porosity. The original porosity was reduced 22% by compaction and cementation dropped 9.81% , while the reservoir space was enhanced 3.88% by dissolution, finally resulting in today's tight sandstone reservoirs with average porosity 7.47%. Comparison shows that the calculated results are basically consistent with the measurements with relative error less than 3%. According to the action intensity of diagenesis, combined with the analysis of rock characteristics, the diagenetic facies of He 8 member reservoir in the study area can be divided into four types, i.e. ,weak-medium cementation strong dissolution facies, medium cementation medium dissolution facies, medium dissolution strong cementation facies and strong compaction tight facies. Gas tests demonstrate that the gas production in the area of weak-medium cementation and strong dissolution phase is relatively considerable, which can be regarded as the main research area for continuous gas production. |
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