苏里格25、76区块上古生界山1-盒8段储层成岩作用及成岩演化序列分析

doi:10.3969/j.issn.1672-9803.2023.02.018

摘要/Abstract

摘要： 苏里格合作区块上古生界山1-盒8段砂岩储层埋深大、致密化程度高,其复杂多样的成岩作用贯穿整个沉积历史,强烈的成岩改造导致储层产能差异化显著,明确其成岩作用类型及成岩演化序列是该区天然气勘探开发亟待解决的关键问题之一。通过镜下薄片、扫描电镜、阴极发光、X射线衍射（XRD）等方法分析化验资料,对苏里格合作区块上古生界山1-盒8段砂岩储层岩石学特征、成岩作用类型与阶段、成岩演化序列进行了系统分析。研究结果表明：山1-盒8段储层主要发育岩屑质石英砂岩和岩屑砂岩,其成分、结构和成熟度均相对较高;压实、胶结、溶蚀、交代作用是影响储层物性的4种主要成岩作用类型,溶蚀与交代作用促进了低孔低渗背景下相对优质储层的形成,压实与胶结作用则是储层致密化的主要原因;山1-盒8段砂岩储层目前处于成岩阶段的中成岩B期,成岩演化序列为：早期机械压实→石英Ⅰ期加大→粒间高岭石交代石英加大边→溶蚀作用→少量自生石英、伊利石胶结→局部石英Ⅱ期加大→铁白云石交代石英,铁方解石胶结、交代→少量长石、方解石溶蚀。基于此建立的成岩演化序列为预测致密砂岩储层甜点提供了科学依据。

关键词: 砂岩储层, 成岩作用, 成岩演化序列, 山1段, 盒8段, 苏里格气田

Abstract: The sandstone reservoir of the Upper Paleozoic Shan 1-He 8 Member in the Sulige Cooperation Block is deeply buried and highly densified. Its complex and diverse diagenesis runs through the entire sedimentary history and the strong diagenetic transformation leads to significant difference in reservoir productivity. Defining its diagenetic type and diagenetic evolution sequence is one of the key issues to be solved urgently in the exploration and development of natural gas in the area. Through microscopic thin section, scanning electron microscope, cathodoluminescence, X-ray diffraction and other analysis and analysis data, the petrological characteristics, types and stages of diagenesis and diagenetic evolution sequence of sandstone reservoirs in Shan 1-He 8 Member of Upper Paleozoic in Sulige Cooperation Block are systematically analyzed. The results show that：（1）The reservoir of Shan 1-He 8 member mainly develops lithic quartz sandstone and lithic sandstone, with relatively high composition and structural maturity;（2）Compaction, cementation, dissolution and metasomatism are the four main diagenesis types that affect the physical properties of the reservoir. Dissolution and metasomatism promote the formation of relatively high-quality reservoirs under the background of low porosity and low permeability. Compaction and cementation are the main reasons for the compaction of the reservoir;（3）The sandstone reservoir of Shan 1-He 8 Member is currently in the middle diagenetic stage B of diagenetic stage, and the diagenetic evolution sequence is summarized as follows： early mechanical compaction→quartz phase I enlargement→intergranular kaolinite metasomatism quartz enlargement edge→dissolution→a small amount of authigenic quartz, illite cementation→local quartz phase Ⅱ enlargement→ferrodolomite metasomatism quartz→ferrocalcite cementation, metasomatism→a small amount of feldspar, calcite dissolution. Based on this, the established diagenetic evolution sequence provides a scientific basis for predicting the sweet spots of tight sandstone reservoirs.

Key words: sandstone reservoir, diagenesis, diagenetic evolution sequence, Shan 1 He 8, Sulige cooperation block.

中图分类号:

TE132.1

于春勇, 董峰, 屈凯旋, 贾雨萌, 郭琼, 白玲. 苏里格25、76区块上古生界山1-盒8段储层成岩作用及成岩演化序列分析[J]. 录井工程, 2023, 34(2): 109-116.

YU Chunyong, DONG Feng, QU Kaixuan, JIA Yumeng, GUO Qiong, BAI Ling. Diagenesis and diagenetic evolution sequence analysis of upper Paleozoic Shan 1-He 8 reservoirs in Sulige 25 and 76 areas[J]. Mud Logging Engineering, 2023, 34(2): 109-116.

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