Characteristics of the volcanic basement reservoirs and its hydrocarbon accumulation mode in Sudeert structural belt,Hailar Basin,China

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  • 1.Institute of Oil and Gas,Peking University,Beijing 100871,China;
    2.School of Earth and Space Science,Peking University,Beijing 100871,China;
    3.CNPC Hailar Exploration and Development Administration,Daqing Oilfield Company,Daqing 163453,China

Received date: 2015-10-07

  Revised date: 2016-03-21

  Online published: 2019-09-11

Abstract

The Sudeert structure belt in Hailar Basin has obviously vertical reservoir differences and various hydrocarbon accumulation patterns.Based on core,fracture feature,reservoir quality and structure modeling,as well as industry performance,the reservoir of Sudeerte structural belt is divided into three obvious parts,namely weathered -layer,leached-layer and the compact zone.The weathered-layer featuring great width and high inclination angle,which develops weathered and associated tectonic fracture,is classified as vuggy reservoir.The leached-layer,featuring irregular width and inclination angle and mainly composed of dissolution and leaching fissures,develops fractured-vuggy reservoir.The compact zone,made up of structural micro-fissures,cultivates tectonic fractures.The fractured zone of the studied area concentrates near the large border vault,in the shallow-middle layer of the fault horst and the middle-deep layer of the cliff.The unique fracture system and structure of the fault-block type buried hills form the ternary reservoir model(fault-fracture cave-unconformity) of the Sudeerte structural zone.The fault at the border migrates mainly along the unilateral direction of the source fault,and the oil/gas mostly concentrates in the three reservoirs of the near-fault zone;oil/gas in the step-fault zone mainly migrates downwards,and concentrates in the reservoirs at the border of cliff and fault horst.Therefore,the potential exploration zone of the Sudeerte structural zone should be the border of the large fault and the shallow-middle layer of the cliff and fault horst.

Cite this article

Cui Xin, Li Jiang-hai, Jiang Hong-fu, Xu Li, Zhang Hong-wei, Wang Hui . Characteristics of the volcanic basement reservoirs and its hydrocarbon accumulation mode in Sudeert structural belt,Hailar Basin,China[J]. Natural Gas Geoscience, 2016 , 27(8) : 1466 -1476 . DOI: 10.11764/j.issn.1672-1926.2016.08.1466

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