Petroleum Exploration and Development >

2018 , Vol. 45 >Issue 3: 361 - 372

DOI: https://doi.org/10.11698/PED.2018.03.01

PETROLEUM EXPLORATION

Geological characteristics of shale rock system and shale oil exploration in a lacustrine basin: A case study from the Paleogene 1st sub-member of Kong 2 Member in Cangdong sag, Bohai Bay Basin, China

  • ZHAO Xianzheng ,
  • ZHOU Lihong ,
  • PU Xiugang ,
  • JIN Fengming ,
  • HAN Wenzhong ,
  • XIAO Dunqing ,
  • CHEN Shiyue ,
  • SHI Zhannan ,
  • ZHANG Wei ,
  • YANG Fei
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  • 1. PetroChina Dagang Oilfield Company, Tianjin 300280, China;
    2. China University of Petroleum (East China), Qingdao 266580, China

Received date: 2017-11-21

  Revised date: 2018-04-25

  Online published: 2018-04-19

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Abstract

A deep understanding of the basic geologic characteristics of the fine-grained shale layers in the Paleogene 1st sub-member of Kong 2 Member (Ek21) in Cangdong sag, Bohai Bay Basin, is achieved through observation of 140 m continuous cores and systematic analysis of over 1 000 core samples from two wells. Basic geological conditions for shale oil accumulation are proposed based on the unconventional geological theory of oil and gas. The shale rock system mainly developed interbedded formation of felsic shale, limy and dolomite shale and carbonates; high quality hydrocarbon source rock formed in the stable and closed environment is the material base for shale oil enrichment; intergranular pores in analcite, intercrystalline pores in dolomite and interlayer micro-fractures make tight carbonate, limy and dolomite shale and felsic shale effective reservoirs, with brittle mineral content of more than 70%; high abundance laminated shale rock in the lower section of Ek21 is rich in shale oil, with a total thickness of 70 m, burial depth between 2 800 to 4 200 m, an average oil saturation of 50%, a sweet spot area of 260 km2 and predicted resources of over 5×108 t. Therefore, this area is a key replacement domain for oil exploration in the Kongdian Formation of the Cangdong sag. At present, the KN9 vertical well has a daily oil production of 29.6 t after fracturing with a 2 mm choke. A breakthrough of continental shale oil exploration in a lacustrine basin is expected to be achieved by volume fracturing in horizontal wells.

Key words： shale oil; fine grained deposits; horizontal well; volume fracturing; shale reservoir sweet spot; Paleogene Kongdian Formation; Cangdong sag; Bohai Bay Basin

Cite this article

ZHAO Xianzheng , ZHOU Lihong , PU Xiugang , JIN Fengming , HAN Wenzhong , XIAO Dunqing , CHEN Shiyue , SHI Zhannan , ZHANG Wei , YANG Fei . Geological characteristics of shale rock system and shale oil exploration in a lacustrine basin: A case study from the Paleogene 1st sub-member of Kong 2 Member in Cangdong sag, Bohai Bay Basin, China[J]. Petroleum Exploration and Development, 2018 , 45(3) : 361 -372 . DOI: 10.11698/PED.2018.03.01

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