Geological heterogeneity of shale sequence and evaluation of shale oil sweet spots in the Qingshankou Formation，Songliao Basin

被引：0
|
作者：
Bai B. [1 ,2 ]
Dai C. [3 ]
Hou X. [1 ]
Yang L. [4 ]
Wang R. [2 ,5 ]
Wang L. [1 ]
Meng S. [1 ,2 ]
Dong R. [1 ]
Liu Y. [1 ]
机构：
[1] Research Institute of Petroleum Exploration and Development, PetroChina, Beijing
[2] National Key Laboratory of Continental Shale Oil, PetroChina, Heilongjiang, Daqing
[3] School of Earth Sciences, East China University of Technology, Jiangxi, Nanchang
[4] Research Institute of Exploration and Development, Jilin Oilfield Company, CNPC, Jilin, Songyuan
[5] Daqing Oilfield Co. Ltd., PetroChina, Heilongjiang, Daqing
来源：
Oil and Gas Geology | 2023年 / 44卷 / 04期
关键词：
continental lacustrine basin; engineering sweet spot; geological sweet spot; Gulong shale oil; organic-rich shale; Qingshankou Formation; Songliao Basin;
D O I：
10.11743/ogg20230404
中图分类号：
学科分类号：
摘要：
The lacustrine sediment of the Cretaceous Qingshankou Formation in the Songliao Basin is rich in organic shale，and the well Guye 1 has achieved a breakthrough in oil exploration of Gulong shale of deep lake facies. To further evaluate the geological characteristics of the shale sequence in different facies zones of the lacustrine basin and evaluate the characteristics of shale oil sweet spots in the continental lacustrine basin，we study the geological heterogeneity of shale sequences in different facies zones of the lacustrine basin regarding the environmental difference for lacustrine shale formation in the Qingshankou Formation. It is suggested that the shale sequences deposited in the freshwater lacustrine basin can be divided into seven types according to lithofacies，namely the organic-rich lamellar clayey shale （TOC>3 %），lamellar clayey shale，felsic shale，lamellar shell shale，massive mudstone，limestone and dolomite respectively，which are evaluated in terms of total hydrocarbon generated and retained，hydrocarbon mobility，reservoir property，compressibility and oil production capacity. The geological and engineering sweet spots of shale oil are thereby proposed. Based on the contents of TOC and S1（pyrolysis hydrocarbon content），we group the geological sweet spots of the Qingshankou Formation shale into TypeⅠ，II，and Ⅲ. The TypeⅠ sweet spot is generally characterized by TOC content greater than 3 % and S1 greater than 4 mg/g；the Type II by TOC content ranging between 1. 5 % and 3 %，and S1 between 1. 0 and 4 mg/g；the Type Ⅲ by TOC content less than 1. 5 % and S1 less than 1. 0 mg/g. The semi-deep lacustrine and deep lacustrine facies are dominated by sweet spots of Type Ⅰ and II ，while the shales of shallow lacustrine facies by sweet spots of Type II and Ⅲ. The Qingshankou Formation shale in Songliao Basin is selected as the major oil pay zone after a comprehensive analysis of the oil-bearing property， percolation coefficient，compressibility，characteristics of source rocks and physical properties of different facies zones. © 2023 Editorial Department of Oil and Gas Geology. All rights reserved.
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页码：846 / 856
页数：10
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共 37 条
  • [1] ZOU Caineng, TAO Shizhen, YANG Zhi, Et al., New advance in unconventional petroleum exploration and research in China[J], Bulletin of Mineralogy，Petrology and Geochemistry, 31, 4, pp. 312-322, (2012)
  • [2] Yi WEI, RAN Qiquan, TONG Min, Et al., A full cycle productivity prediction model of fractured horizontal well in tight oil reservoirs [J], Journal of Southwest Petroleum University （Science & Technology Edition）, 38, 1, pp. 99-106, (2016)
  • [3] Yang LI, Opportunities and challenges for Sinopec to develop tight oil reservoirs[J], Petroleum Drilling Techniques, 43, 5, pp. 1-6, (2015)
  • [4] ZHAO Wenzhi, ZHU Rukai, LIU Wei, Et al., Lacustrine medium-high maturity shale oil in onshore China：Enrichment conditions and occurrence features[J], Earth Science Frontiers, 30, 1, pp. 116-127, (2023)
  • [5] ZHAO Wenzhi, HU Suyun, HOU Lianhua, Et al., Types and resource potential of continental shale oil in China and its boundary with tight oil [J], Petroleum Exploration and Development, 47, 1, pp. 1-10, (2020)
  • [6] FU Jinhua, LIU Xianyang, LI Shixiang, Et al., Discovery and resource potential of shale oil of Chang 7 member， Triassic Yanchang Formation，Ordos Basin[J], China Petroleum Exploration, 26, 5, pp. 1-11, (2021)
  • [7] ZHAO Wenzhi, BIAN Congsheng, LI Yongxin, Et al., Enrichment factors of movable hydrocarbons in lacustrine shale oil and exploration potential of shale oil in Gulong Sag，Songliao Basin，NE China[J], Petroleum Exploration and Development, 50, 3, pp. 455-467, (2023)
  • [8] ZHOU Lihong, HE Haiqing, GUO Xujie, Et al., Main factors controlling the medium-mature shale oil enrichment and exploration breakthrough in the Paleogene Lower E<sub>3</sub>s<sup>1L</sup> in Qikou Sag，Bohai Bay Basin[J], Oil & Gas Geology, 43, 5, pp. 1073-1086, (2022)
  • [9] SUN Longde, CUI Baowen, ZHU Rukai, Et al., Shale oil enrichment evaluation and production law inGulong Sag，Songliao Basin，NE China[J], Petroleum Exploration and Development, 50, 3, pp. 441-454, (2023)
  • [10] ZHAO Wenzhi, HU Suyun, ZHU Rukai, Et al., Formation and distribution of nonmarine shale oil in China [M], pp. 106-177, (2022)
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