准噶尔盆地玛南地区二叠系致密砾岩储层特征及形成有利条件

doi:10.3969/j.issn.1672-7703.2023.05.008

摘要/Abstract

摘要： 准噶尔盆地玛南地区二叠系致密砾岩领域已获突破，为明确其主要特征及形成有利条件，利用已钻井各类资料和数据对储层展开系统研究。结果表明，储层岩性主要为扇三角洲分流河道砾岩，属于低—特低孔、低—特低渗致密砾岩储层，结构成熟度中等；砾石成分主要为凝灰岩，成分成熟度较低，胶结物以浊沸石和方解石为主；孔隙以长石和暗色矿物粒内溶孔及沸石类和碳酸盐胶结物粒间溶孔两类溶孔为主，裂缝较发育，共同形成了有效储集体系；埋深3200～3840m和4200～5200m发育两个次生孔隙带，且均位于异常高压带中。成岩效应、裂缝发育和异常高压是玛南地区二叠系致密砾岩储层形成有效储层的有利条件。

关键词: 玛南地区, 致密储层特征, 次生孔隙, 形成因素

Abstract: Breakthroughs have been made in the Permian tight conglomerate in Manan area in Junggar Basin. The systematic reservoir study is conducted by using various data of drilled wells to identify the main characteristics and favorable conditions for forming reservoir. The study results show that the reservoir is mainly composed of conglomerates of fan delta distributary channel facies, which shows a tight conglomerate reservoir with low-ultra low porosity and low-ultra low permeability, and medium textural maturity; The main composition of the gravel is tuff, with low compositional maturity, and the cements are dominated by laumontite and calcite; The pores mainly include intragranular dissolution pores of feldspar and dark minerals, as well as intergranular dissolution pores of zeolite and carbonate cements, and the fractures are relatively well developed, jointly forming an effective reservoir system; Two secondary pore zones are observed at intervals 3200-3840 m and 4200-5200 m, and both are located in the abnormal high pressure zone. The diagenesis, fractures and abnormal high pressure are favorable conditions for forming effective tight conglomerate reservoir in the Permian.

中图分类号:

TE112.2

薛晶晶, 白雨, 李鹏, 晏奇, 余兴, 庞雷. 准噶尔盆地玛南地区二叠系致密砾岩储层特征及形成有利条件[J]. 中国石油勘探, 2023, 28(5): 99-108.

Xue Jingjing, Bai Yu, Li Peng, Yan Qi, Yu Xing, Pang Lei. Characteristics and favorable conditions for the formation of the Permian tight conglomerate reservoir in Manan area, Junggar Basin[J]. China Petroleum Exploration, 2023, 28(5): 99-108.

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