The Geological Characteristics and Exploration Potential of Tight Oil in Small Fault-subsided Lake Basins,China
Received date: 2014-04-14
Revised date: 2015-04-30
Online published: 2015-09-10
To understand resource potential of tight oil in small fault-subsided lake basins of China,this paper mainly takes the Lower Xinhe Formation of the Middle Jurassic in Northwest China as an example.According to the data of geochemistry，reservoir physical property，thin section,electron microscope scanning，energy spectrum,etc.,this study systematically investigated geological characteristics of tight oil in the Lower Xinhe Formation of the basin.The result indicated that(1)Depocenter and subsidence center are not overlapped in the source rocks of the Lower Xinhe Formation.The high abundance of source rock(TOC>1%)in the Lower Xinhe Formation is mainly distributed in the middle and eastern sag of the basin.While,mature source rocks are mainly distributed in the middle and western sag of the basin.(2)The mineral composition of sandstones in the Lower Xinhe Formation are predominantly quartz,feldspar,carbonate rocks and clay minerals.Quartz and feldspar contents are relatively high,with an average of 60%.The reservoirs are dense and poriferous,permeability is generally less than 10% and 1×10-3μm2,but oil saturation distribution is at 10%-60%.(3)The oil-bearing tight reservoirs are located in the middle and bottom of Lower Xinhe Formation,and the plane is mainly distributed in Xiaohuzi Sag.Four types of pores are presented in the tight sandstones of the Lower Xinhe Formation,such as interparticle pores,intraparticle pores,fracture pores and organic-matter pores.The first three are more common in minerals.(4)In the Lower Xinhe Formation,oil reservoir has high pressure coefficient,while the density of crude oil is not heavy.The oil and gas has four ways of occurrence manners in the tight reservoirs,such as interparticle pores,dissolved pores,intercrystalline pores and micro-fracture.The Yabulai Basin has two tight oil exploration targets,the slope of Yanchang Sag and deep depression zones of Xiaohuzi Sag.Industrial oil flow was obtained in deep depression zones of Xiaohuzi Sag,suggesting a great resource potential and favorable targets for future exploration.
HUANG Jun-ping，YANG Zhan-long，MA Guo-fu，LI Tao，DI Jun，ZHU Jun-jie，LI Zhi-yong，HUANG Cheng-gang . The Geological Characteristics and Exploration Potential of Tight Oil in Small Fault-subsided Lake Basins,China[J]. Natural Gas Geoscience, 2015 , 26(9) : 1763 -1772 . DOI: 10.11764/j.issn.1672-1926.2015.09.1763
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