准噶尔盆地玛湖凹陷侏罗系油气藏特征及勘探潜力

doi:10.3969/j.issn.1672-7703.2019.03.007

摘要/Abstract

摘要： 准噶尔盆地玛湖凹陷侏罗系多口井新获突破，基于已钻探井，利用钻井地质、岩心、实验分析及地震资料，系统研究玛湖凹陷侏罗系油气成藏特征及有利条件，并结合成藏主控因素预测成藏有利区，指出了玛湖凹陷侏罗系下步勘探方向与部署建议。研究认为玛湖凹陷侏罗系油气藏发育原生与次生两种油气藏，以次生断块、断层—岩性油气藏为主；油藏埋藏浅、厚度适中，物性中等；凹陷内断裂控运移、鼻凸控聚集，物源充足、储层发育，侏罗系成藏有利。综合评价认为玛湖凹陷侏罗系油气藏有利区主要分布在环凹陷斜坡发育的鼻状凸起区，与该凹陷二叠系、三叠系主力产层有利区重叠，建议将侏罗系作为浅层高效领域进行兼探。

关键词: 准噶尔盆地, 玛湖凹陷, 侏罗系, 油藏特征, 勘探潜力

Abstract: Many wells have achieved new breakthrough in Jurassic in Mahu sag of the Junggar Basin. The characteristics and favorable conditions of Jurassic hydrocarbon accumulation in Mahu sag were studied systematically based on the geological, core, experimental analysis and seismic data of existing exploration wells. Then, based on the main factors controlling hydrocarbon accumulation, the favorable areas for hydrocarbon accumulation were predicted. Finally, the following exploration directions and deployment suggestions of Jurassic in Mahu sag were proposed. It is indicated that two kinds of oil and gas reservoirs (i.e., primary and secondary oil and gas reservoirs) are developed in Jurassic in Mahu sag, and secondary faulted block and fault-lithologic oil and gas reservoirs are dominant. The oil reservoirs are characterized by small burial depth, moderate thickness and moderate physical properties. The conditions of fault controlling migration, nose-like salient controlling accumulation, sufficient sources and developed reservoirs are favorable for Jurassic hydrocarbon accumulation in Mahu sag. It is concluded from the comprehensive evaluation that the favorable areas for the Jurassic oil and gas reservoirs in Mahu sag are mainly distributed in the nose-like salient developed in the slope around the sag and they are superimposed with the favorable areas of the principal producing formations in Permian and Triassic, Mahu sag. It is recommended to take Jurassic as the shallow efficient field for concurrent exploration.

Key words: Junggar Basin, Mahu sag, Jurassic, oil reservoir characteristics, exploration potential

中图分类号:

宋涛, 黄福喜, 汪少勇, 杨帆, 吕维宁, 刘策, 贾鹏, 范晶晶. 准噶尔盆地玛湖凹陷侏罗系油气藏特征及勘探潜力[J]. 中国石油勘探, 2019, 24(3): 341-350.

Song Tao, Huang Fuxi, Wang Shaoyong, Yang Fan, Lv Weining, Liu Ce, Jia Peng, Fan Jingjing. Characteristics and exploration potential of Jurassic oil and gas reservoirs in Mahu sag of the Junggar Basin[J]. China Petroleum Exploration, 2019, 24(3): 341-350.

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