东营凹陷北部陡坡带砂砾岩优质储层成因

摘要/Abstract

摘要： 通过大量实测数据统计、薄片鉴定和对比分析，从沉积、成岩和成烃多个角度研究了东营凹陷北部陡坡带砂砾岩优质储层成因，认为东营凹陷北部陡坡带砂砾岩纵向上主要发育两个孔隙发育带，对应深度分别为1650～2450m和2950～3300m。研究表明，两个孔隙发育带成因不尽相同，其中，1650～2450m孔隙发育带储集空间以原生孔隙为主，受沉积作用控制明显，主要发育在泥质含量低、分选较好、粒度适中的扇中相带砂砾岩中；2950～3300m孔隙发育带储集空间以碳酸盐、长石和石英溶蚀的次生孔隙为主，是早期碱性流体与后期烃源岩生烃形成的有机酸交替溶蚀作用的结果，早期的碳酸盐胶结和烃类充注抑制了压实作用和胶结作用的进行，有利于孔隙的保存。

关键词: 东营凹陷, 砂砾岩, 孔隙发育带, 原生孔隙, 次生孔隙, 有机酸, 碱性流体, 溶蚀

Abstract: Based on measured data statistics, thin section analysis and comparative analysis, the genetic mechanism of high-quality glutenite reservoirs at the steep slope in northern Dongying sag was studied from the aspects of sedimentation, diagenesis and hydrocarbon generation. Two pore zones were found vertically at the steep slope in northern Dongying sag, at the buried depth of 1650-2450 m and 2950-3300 m respectively. The study shows that the pore zones are different in genetic mechanism. In the first pore zone (1650-2450 m), the reservoir space is composed of primary pores, which due to the significant control of sedimentation are developed in mid-fan glutenites with low shale content, better sorting degree and moderate grain size. In the second pore zone (2950-3300 m), the reservoir space is composed of secondary pores which were generated by the dissolution of carbonates, felspars and quartz, as the result of alternative dissolution between earlier alkaline fluids and later organic acids formed by hydrocarbon generation of source rocks. The carbonate cementation and hydrocarbon charging at the early stage inhibited the compaction and cementation, contributing to the preservation of pores.

Key words: Dongying sag, glutenite, pore zone, primary pores, secondary pores, organic acid, alkaline fluid, dissolution

王永诗, 王勇, 朱德顺, 丁桔红, 尚冰, 朱家俊. 东营凹陷北部陡坡带砂砾岩优质储层成因[J]. 中国石油勘探, 2016, 21(2): 28-36.

Wang Yongshi, Wang Yong, Zhu Deshun, Ding Juhong, Shang Bing, Zhu Jiajun. Genetic mechanism of high-quality glutenite reservoirs at the steep slope in northern Dongying sag[J]. China Petroleum Exploration, 2016, 21(2): 28-36.

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