Special Oil & Gas Reservoirs >

2020 , Vol. 27 >Issue 4: 54 - 59

DOI: https://doi.org/10.3969/j.issn.1006-6535.2020.04.008

Geologic Exploration

Hydrocarbon Accumulation Main-Controlling Factor Analysis of Chang2 Reservoir in Zhijing-Ansai of Ordos Basin

  • Feng Shunyan ,
  • Zhang Xiaohui ,
  • Li Cheng ,
  • Jing Xianghui ,
  • Sun Lei
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  • 1. PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China;
    2. State Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an, Shaanxi 710018, China;
    3. CNPC Greatwall Drilling Company, Panjin, Liaoning 124010, China

Received date: 2019-09-13

  Revised date: 2020-05-06

  Online published: 2022-02-18

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Abstract

In order to understanding the complex geology of Chang2 oil reservoir in Zhijing-Ansai and determine the main-controlling factors of hydrocarbon enrichment, the sedimentary facies, sandbody distribution patterns, favorable traps and other hydrocarbon enrichment mechanisms were comprehensively analyzed by the researches on source-rock, sedimentary facies, favorable sandbodies, migration channels, trap conditions, etc. Result indicates that the hydrocarbon enrichment in Chang2 oil reservoir are dependent on multiple factors, including hydrocarbon source, unconformity, low-amplitude structure, sedimentary facies, reservoir properties, caprock properties, etc. The matching between the high-permeability sandbodies at the junction of distributary channels and the near-east row nose-shaped uplift is favorable to hydrocarbon accumulation. The caprock and longitudinal sandbody structures result in the hydrocarbon enrichment in Chang2Ⅰ3 sub-layer. There are lithology, structure-lithology and weak structure-lithology reservoir categories in Chang2 oil reservoir due to multiple controlling factors. This research could provide certain guidance for the further exploration in Chang2 oil reservoir.

Key words： Ordos Basin; Zhijing-Ansai; Chang2 oil reservoir; hydrocarbon accumulation main-controlling factor; reservoir category

Cite this article

Feng Shunyan , Zhang Xiaohui , Li Cheng , Jing Xianghui , Sun Lei . Hydrocarbon Accumulation Main-Controlling Factor Analysis of Chang2 Reservoir in Zhijing-Ansai of Ordos Basin[J]. Special Oil & Gas Reservoirs, 2020 , 27(4) : 54 -59 . DOI: 10.3969/j.issn.1006-6535.2020.04.008

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