Lower Es3 in Zhanhua Sag, Jiyang Depression: a case study for lithofacies classification in lacustrine mud shale
Yan Jian-Ping1,2, He Xu2, Hu Qin-Hong3, Liang Qiang4, Tang Hong-Ming1,2, Feng Chun-Zhen5, and Geng Bin6
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), Chengdu 610500, China.
2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China.
3. Department of Earth and Environmental Science, University of Texas at Arlington, Texas 76019, USA.
4. No. 2 Gas Production Plant, Changqing Oilfield Company, PetroChina,Yulin 719000, China.
5. Changqing Division, China Petroleum Logging CO. LTD., Xi’an 718500, China.
6. Institute of Exploration and Development, ShengLi Oil Field, SINOPEC, Dongying 257015, China.
Abstract Oil and gas exploration in lacustrine mud shale has focused on laminated calcareous lithofacies rich in type I or type II1 organic matter, taking into account the mineralogy and bedding structure, and type and abundance of organic matter. Using the lower third member of the Shahejie Formation, Zhanhua Sag, Jiyang Depression as the target lithology, we applied core description, thin section observations, electron microscopy imaging, nuclear magnetic resonance, and fullbore formation microimager (FMI) to study the mud shale lithofacies and features. First, the lithofacies were classified by considering the bedding structure, lithology, and organic matter and then a lithofacies classification scheme of lacustrine mud shale was proposed. Second, we used optimal filtering of logging data to distinguish the lithologies. Because the fractals of logging data are good indicators of the bedding structure, gamma-ray radiation was used to optimize the structural identification. Total organic carbon content (TOC) and pyrolyzed hydrocarbons (S2) were calculated from the logging data, and the hydrogen index (HI) was obtained to identify the organic matter type of the different strata (HI vs Tmax). Finally, a method for shale lithofacies identification based on logging data is proposed for exploring mud shale reservoirs and sweet spots from continuous wellbore profiles.
This work was supported by the National Natural Science Foundation of China (Nos. 41202110 and 51674211) and Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) (No. PLN201612), the Applied Basic Research Projects in Sichuan Province (No. 2015JY0200) and the Open Fund Project from Sichuan Key Laboratory of Natural Gas Geology (No. 2015trqdz07).
Cite this article:
. Lower Es3 in Zhanhua Sag, Jiyang Depression: a case study for lithofacies classification in lacustrine mud shale[J]. APPLIED GEOPHYSICS, 2018, 15(2): 151-164.
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