The whole petroleum system with ordered coexistence of conventional and unconventional hydrocarbons: Case from the Junggar Basin, China

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

AAPG Bulletin Pub Date : 2024-07-01 DOI:10.1306/06192322086

Yong Tang, Jian Cao, Wenjun He, Yin Liu, Zhijun Qin, Liliang Huang

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Abstract

The petroleum system concept and related theory are systematically reviewed in this work using published studies. In light of the recent success in exploiting unconventional petroleum resources, the classic petroleum system concept cannot be used to account for the vast unconventional oil and gas accumulations within the petroleum system. The whole petroleum system model is here adopted to investigate both the conventional and unconventional hydrocarbon resources in the Mahu sag, Junggar Basin, China. The whole petroleum system in the study area developed in Permian strata deposited within a large, alkaline lacustrine basin, comprising conventional and unconventional reservoirs that coexist orderly. The Permian Fengcheng Formation in the Junggar Basin is a unique alkaline lacustrine source rock that ranges from low maturity to high maturity, contains abundant organic matter and volcanic materials, and has a high oil-generating potential. Different types of hydrocarbon reservoirs are distributed from the margin to the center of the sag and vary from conventional fan-delta accumulations in fold-thrust belts (i.e., conventional conglomerate reservoirs) to unconventional tight and shale oil accumulations located within the source rock sequences. The distribution and coexistence of different types of hydrocarbon accumulations in the Mahu sag provide new opportunities for exploration and insights into the development of petroleum systems. This whole petroleum system model that developed in the Junggar Basin has implications for the exploration of both conventional and unconventional hydrocarbons in petroleum basins worldwide, especially in deep strata.

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常规和非常规油气有序共存的整体石油系统：中国准噶尔盆地案例

本研究利用已发表的研究成果，对石油系统概念和相关理论进行了系统回顾。鉴于近年来非常规石油资源的成功开发，经典的石油系统概念已无法解释石油系统中巨大的非常规油气储量。本文采用整体石油系统模型来研究中国准噶尔盆地马湖凹陷的常规和非常规油气资源。研究区的整体石油系统发育于沉积于大型碱性湖相盆地内的二叠系地层中，由有序共生的常规储层和非常规储层组成。准噶尔盆地的二叠系凤城地层是一种独特的碱性湖相源岩，成熟度由低到高，含有丰富的有机质和火山物质，具有很高的生油潜力。不同类型的碳氢化合物储层从矢状岩边缘到中心分布，从褶皱推覆带中的常规扇三角洲储层（即常规砾岩储层）到位于源岩层序中的非常规致密油和页岩油储层，不一而足。马湖凹陷中不同类型碳氢化合物储集层的分布和共存为勘探提供了新的机遇，也为了解石油系统的发展提供了新的视角。在准噶尔盆地开发的这一整体石油系统模型对全球石油盆地，特别是深地层的常规和非常规碳氢化合物勘探都有借鉴意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AAPG Bulletin 工程技术-地球科学综合

CiteScore

6.60

自引率

11.40%

发文量

审稿时长

4.8 months

期刊介绍： While the 21st-century AAPG Bulletin has undergone some changes since 1917, enlarging to 8 ½ x 11” size to incorporate more material and being published digitally as well as in print, it continues to adhere to the primary purpose of the organization, which is to advance the science of geology especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources. Delivered digitally or in print monthly to each AAPG Member as a part of membership dues, the AAPG Bulletin is one of the most respected, peer-reviewed technical journals in existence, with recent issues containing papers focused on such topics as the Middle East, channel detection, China, permeability, subseismic fault prediction, the U.S., and Africa.