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为揭示苏里格气田西部下二叠统石盒子组第8段(简称盒8段)相对优质储层的时空展布规律并给储层预测提供依据,基于铸体薄片、扫描电镜、X光衍射和电子探针等分析化验资料,对盒8段储层的成岩作用及其演化进行了研究。结果认为:①盒8段储层岩石类型主要为岩屑石英砂岩,其次为石英砂岩,碎屑颗粒组合具有高石英、高岩屑、低长石的特点,填隙物以杂基和硅质为主;②该储层经历的成岩作用中,压实作用、胶结作用和交代蚀变作用对孔隙发育主要起到破坏性影响;溶蚀作用和破裂作用主要对孔隙发育起建设性作用,特别是溶蚀作用形成的大量次生孔,成为主要储集空间;③胶结压实相与强溶蚀相组合为最有利的储层发育区,胶结压实相与中等溶蚀相组合属于较有利储集层发育区,相对优质储层主要发育于冲积平原的主河道和三角洲平原的分流河道上且与溶蚀作用所形成的次生孔的分布及胶结物的类型、含量有着紧密的关系。
In order to reveal the temporal and spatial distribution of the relatively high-quality reservoirs in the eighth member of the Lower Permian Shixianzi Formation (Box 8) in the western Sulige Gas Field and to provide evidence for the reservoir prediction, based on cast thin films, scanning electron microscopy, X-ray Diffraction and electron probe analysis of laboratory data, the box 8 reservoir diagenesis and its evolution were studied. The results show that: ① The reservoirs in Box 8 are mainly lithic quartz sandstone, followed by quartz sandstone. The combination of detrital pellets has the characteristics of high quartz, high lithic and low feldspar. In the diagenesis, the compaction, cementation and metasomatic alteration play a devastating influence on the pore development. The dissolution and fracture mainly play a constructive role in pore development, especially the dissolution The formation of a large number of secondary pores, as the main reservoir space; ③ combination of cementing compaction and strong dissolution phase of the most favorable reservoir development zone, cementing compaction phase and moderate dissolution phase belongs to more favorable reservoir development zone The relatively high-quality reservoirs are mainly developed in the main channel of alluvial plain and distributary channel in delta plain, and are closely related to the distribution of secondary pores formed by dissolution and the type and content of cements.