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首页> 外文期刊>Geological Journal >Diagenesis and reservoir quality in tight gas sandstones: The fourth member of the Upper Triassic Xujiahe Formation, Central Sichuan Basin, Southwest China
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Diagenesis and reservoir quality in tight gas sandstones: The fourth member of the Upper Triassic Xujiahe Formation, Central Sichuan Basin, Southwest China

机译：耐燃气砂岩的成岩作用和储层质量：四川盆地中部三叠纪徐家河组的第四部分，中国西南部

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>Mineralogical, petrographic, and geochemical analyses were performed to investigate the sandstone composition and texture, pore system, and diagenetic minerals of Upper Triassic sandstones in the Central Sichuan Basin, Southwest China. The results show that authigenic quartz, clay minerals, and carbonates are the main pore‐filling constituents. The pore systems consist of intergranular porosity, secondary porosity, microporosity, and microfractures. Loss of depositional porosity is greater due to compaction than to cementation. Eodiagenesis includes mechanical compaction, precipitation of early calcite cements, kaolinite, and smectite, and leaching of feldspars by meteoric water. Mesodiagenesis consists of compaction, framework grain dissolution, and subsequent precipitation of illite, quartz, and late carbonate cements. Six lithofacies were identified on the basis of petrographic analyses, namely, (a) argillaceous sandstones; (b) poorly sorted sandstones; (c) quartz‐cemented sandstones; (d) carbonate‐cemented sandstones; (e) clay‐mineral‐cemented sandstones, and (f) clean sandstones with abundant secondary porosity. The best reservoir‐quality rocks have high percentages of detrital quartz but low percentages of matrix, quartz, and carbonate cement. Differences in textural and compositional attributes of various lithofacies significantly affect porosity‐depth trends. The diagenetic evolution pathways and reservoir‐quality prediction models of various lithofacies are reconstructed by integrated petrographic data. This work provides insights into describing the different lithofacies by petrographic analysis and helps to investigate how detrital composition and texture influence the diagenesis and reservoir quality evolution in tight gas sandstones.
机译： >矿物学，岩体和地球化学分析进行了研究砂岩组成和质地，孔隙系统和成岩中部三叠系砂岩矿物质在中国西南部四川盆地。结果表明，作者石英，粘土矿物质和碳酸盐是主要的孔隙填充成分。孔系统由晶间孔隙率，次级孔隙率，微孔和微磨损组成。由于压实而不是胶结，沉积孔隙率的损失更大。 eodiaGenesis包括机械压实，早期方解石水泥，高岭石和蒙脱石的沉淀，并通过易于流水浸出。 Mesodiagenesis由压实，骨架晶粒溶解和随后的illite沉淀，石英和晚期碳酸钠水泥。在岩体分析的基础上鉴定了六种锂外差分，即（a）泥质砂岩; （b）砂岩不良; （c）石英静态砂岩; （d）碳酸盐粘液砂岩; （e）粘土矿物粘土砂岩，（f）含有丰富的二级孔隙度的砂岩。最好的水库质量岩石具有高百分比的滴乳石英，但基质，石英和碳酸盐水泥的百分比低。各种锂缺失的纹理和组成属性的差异显着影响孔隙率深度趋势。通过综合的岩体数据重建各种锂外的成岩进化途径和水库质量预测模型。这项工作提供了描述通过岩体分析描述不同的锂缺陷的见解，并有助于调查滴注组成和质量如何影响紧煤气砂岩中的成岩作用和储层质量演变。

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