低渗致密砂岩储集层致密化成因——以准噶尔盆地莫北—莫索湾凸起下侏罗统八道湾组为例

doi:10.7657/XJPG20210104

摘要/Abstract

摘要：

利用岩石薄片、铸体薄片、X射线衍射全岩矿物分析、扫描电镜、物性等资料,对准噶尔盆地莫北—莫索湾凸起下侏罗统八道湾组致密储集层岩石学特征、物性特征和成岩作用特征进行研究,并在此基础上分析了八道湾组储集层致密化机理。结果表明,八道湾组储集层具有低成分成熟度、低填隙物含量和高塑性岩屑含量的特征,经历了强压实作用、弱胶结作用和普遍的溶蚀作用;压实作用强是八道湾组储集层致密化的最主要因素,而八道湾组煤系酸性成岩流体造成的强流体压实效应,以及高塑性岩屑含量造成的强静岩压实效应是导致八道湾组强压实作用的主要原因;中粗砂岩—粗砂岩塑性岩屑含量低,虽然流体压实效应较强,但静岩压实效应弱,储集层物性好,是最有利的储集砂体。

关键词: 准噶尔盆地, 莫北凸起, 莫索湾凸起, 侏罗系, 八道湾组, 致密砂岩储集层, 压实作用

Abstract:

Based on the rock thin section, casting thin section and X-ray diffraction whole-rock mineral analyses, and the data of scanning electron microscopy and reservoir physical properties, the petrologic, physical and diagenetic characteristics of the tight reservoirs in the lower Jurassic Badaowan formation of the Mobei-Mosuowan swell in Junggar basin were studied, and the genesis of reservoir densification was analyzed. The results show that the reservoirs are characterized by low compositional maturity, low content of interstitial matter and high content of plastic debris, and that the reservoirs have experienced strong compaction, weak cementation and general dissolution. Strong compaction is the most important factor on the reservoir densification, which is caused by strong compaction from acid diagenetic fluid in coal measures and strong static rock compaction from the high content of plastic debris in the Badaowan formation. Due to the low plastic debri content, the medium-coarse sandstone and coarse sandstone have strong fluid compaction effect and weak static rock compaction effect, therefore the medium-coarse and coarse sandstone reservoirs in Badaowan formation have good physical properties and are favorable for oil and gas accumulation.

Key words: Junggar basin, Mobei swell, Mosuowan swell, Jurassic, Badaowan formation, tight sandstone reservoir, compaction

中图分类号:

TE112.23

单祥, 郭华军, 陈希光, 窦洋. 低渗致密砂岩储集层致密化成因——以准噶尔盆地莫北—莫索湾凸起下侏罗统八道湾组为例[J]. 新疆石油地质, 2021, 42(1): 29-37.

SHAN Xiang, GUO Huajun, CHEN Xiguang, DOU Yang. Genesis of Densification of Low-Permeability Tight Sandstone Reservoirs: A Case Study of Lower Jurassic Badaowan Formation in Mobei-Mosuowan Swell, Junggar Basin[J]. Xinjiang Petroleum Geology, 2021, 42(1): 29-37.

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