Integration of diagenesis, porosity evolution, and oil emplacement in lacustrine tight sandstone reservoirs: A review with illustrative cases from the major oil-bearing basins in China

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

AAPG Bulletin Pub Date : 2024-04-01 DOI:10.1306/12212322063

Kelai Xi, Yingchang Cao, Rukai Zhu, Honggang Xin, Weidong Dan, Helge Hellevang

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Abstract

Tight sandstone oil is currently one of the most important unconventional hydrocarbon resources in China. The coupling relationship between porosity evolution and oil emplacement determines the reservoir effectiveness and oil exploration potential in tight sandstones. Complex diagenetic alterations, however, make research on porosity evolution much more difficult than that on conventional sandstone reservoirs. This study examines the typical lacustrine tight sandstones from western to eastern China. The reservoir lithologies, characteristics, and paragenetic sequences of the diagenesis are reviewed, and an integrated analysis of diagenesis, porosity evolution, and oil emplacement is proposed.Results demonstrate that diagenesis is influenced by rock composition and lithological associations. For example, calcite cementation is primarily controlled by the distance to the sandstone–mudstone interface, whereas zeolite cements are related to volcanic rock fragments. Furthermore, we established a porosity evolution recovery method with respect to the paleoburial depth (or time) of major diagenetic events, including the evaluation of the relationship between the thin section and helium porosity and oil emplacement. We clarified the formation time and the underlying mechanisms. Three typical examples from the major oil-bearing basins in China were chosen to analyze the integration process of diagenesis, the porosity evolution of tight sandstones, as well as the coupling relationship between porosity evolution and oil emplacement. Tight sandstones characterized by different diagenetic alterations exhibit different coupling relationships between porosity evolution and oil emplacement. Our study can provide important guidance for reservoir quality prediction and oil exploration potential evaluation.

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湖相致密砂岩储层成因、孔隙度演化与石油赋存的整合：中国主要含油盆地实例综述

致密砂岩油是中国目前最重要的非常规油气资源之一。孔隙度演化与石油赋存之间的耦合关系决定了致密砂岩的储层有效性和石油勘探潜力。然而，复杂的成岩蚀变使得孔隙度演化研究比常规砂岩储层研究更加困难。本研究考察了中国西部至东部典型的湖相致密砂岩。研究结果表明，成岩作用受岩石组成和岩性关联的影响。例如，方解石胶结主要受砂岩-泥岩界面距离的控制，而沸石胶结则与火山岩碎片有关。此外，我们还建立了一种与主要成岩事件的古生代深度（或时间）相关的孔隙度演化恢复方法，包括对薄断面和氦孔隙度与石油赋存之间关系的评估。我们明确了形成时间和基本机制。选取中国主要含油盆地的三个典型实例，分析了致密砂岩成岩整合过程、孔隙度演化过程以及孔隙度演化与石油赋存的耦合关系。不同成因蚀变特征的致密砂岩表现出不同的孔隙度演化与石油赋存的耦合关系。我们的研究可为储层质量预测和石油勘探潜力评价提供重要指导。

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.