Title: Occurrence characteristics and relation to oil and gas distribution of bedding fractures in tight sandstone

Authors: Yande Zhao; Weili Wang; Ruiliang Guo; Jing Zhao; Xiao Hui; Weibin Wang

Addresses: Bailie School of Petroleum Engineering, Lanzhou City University, Lanzhou, Gansu, 730070, China; The State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510630, China ' School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China; Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China ' School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China; Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China; Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou 730000, Gansu, China ' Xi'an Changqing Chemical and Engineering Group Co., Ltd. of Petrochina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China ' Research Institute of Exploration and Development, Changqing Oilfield Company, CNPC, Xi'an 710018, China ' Research Institute of Exploration and Development, Changqing Oilfield Company, CNPC, Xi'an 710018, China

Abstract: The existence of bedding fractures has a very important influence on the formation and distribution of tight sandstone oil and gas reservoirs. In this paper, the occurrence characteristics of bedding fractures and their influence on oil and gas distribution were preliminarily studied. The results show that bedding fractures are generally developed in high energy hydrodynamic environments such as river channel, sea (lake) bank and beach, in which parallel bedding is the main type. The existence of dark minerals leads to weak laminar adhesion. Beddings weak the bond force of laminae due to the existing of dark minerals. The pore development condition of bedding fractures is better than that of the upper and lower sandstone laminae. Influenced by these, bedding fractures become important channels for hydrocarbon migration. [Received: April 23, 2021; Accepted: January 2, 2022]

Keywords: occurrence characteristics; oil and gas distribution; bedding fractures; tight sandstone oil and gas reservoirs.

DOI: 10.1504/IJOGCT.2022.125369

International Journal of Oil, Gas and Coal Technology, 2022 Vol.31 No.2, pp.105 - 121

Received: 22 Apr 2021
Accepted: 02 Jan 2022
Published online: 07 Sep 2022 *

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