Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 18-26.doi: 10.12108/yxyqc.20180603

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Development characteristics of igneous rocks and its role in hydrocarbon accumulation in Hari Sag, Yingen-Ejinaqi Basin

BAI Xiaoyin, HAN Changchun, HE Yonghong, REN Laiyi, MA Fangxia, CHEN Zhijun, LIU Huchuang   

  1. Research Institute of Shaanxi Yanchang Petroleum(Group) Co. Ltd, Xi'an 710075, China
  • Received:2018-06-06 Revised:2018-08-10 Online:2018-11-16 Published:2018-11-16

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Abstract: The Hari Sag is a small fault depression in northern Yingen-Ejinaqi Basin, with low exploration degree, complex lithology and widely developed igneous rocks. In order to further clarify the development characteristics of igneous rock and their influences on hydrocarbon accumulation in the study area, the mineral characteristics, zircon U-Pb chronology, seismic facies, development period and eruption model of igneous rocks were studied, and the influences of volcanic activities on hydrocarbon accumulation in Hari Sag were analyzed in combination with exploration practice. The results show that: (1)There are many types of igneous rocks developed in the study area such as volcanic breccia, tuff, basalt, dacite and andesite. The seismic reflection characteristics are mainly manifested in three types of mainly mound-like seismic facies, cone-shaped seismic facies and parallel plate-like seismic facies. (2)According to the comprehensive study of zircon dating and seismic facies of igneous rocks, there are three stages of volcanic activity in the study area since Late Paleozoic, which are Late Permian, Early Cretaceous Bayingobi Formation and Suhongtu Formation, and the first two stages are central eruption mode, while the latter is typical cracked eruption model. (3)Multi-stage volcanic activity and continuous magmatic hydrothermal activity promoted the rapid maturation of organic matters in source rocks and dolomitization of reservoirs. (4)Igneous rocks with good matching relationship with source rocks and pore and micro-fracture developed are favorable areas for oil and gas exploration. The research results will provide guidance for understanding the characteristics of igneous rocks and the next step of oil and gas exploration and deployment.

Key words: igneous rocks, zircon dating, development stage, eruption mode, hydrocarbon accumulation, Hari Sag, Yingen-Ejinaqi Basin

CLC Number: 

  • TE122.2
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