Reservoir Characteristics and Storage Mechanism of Xishanyao Formation in Shanle Area,Tuha Basin
Received date: 2009-03-16
Revised date: 2009-05-14
Online published: 2009-10-10
Low permeability hydrocarbon reservoirs in the Shanle area have two secondary pore zones vertically: Middle Xinshanyao Formation and Sangonghe Formation oil layers. In the secondary pore zones, potassium feldspar is corroded intensely; authigenic kaolinites are well developed with more than 25% relative content and occur as book and vermicular kaolinites between the skeletal grains. The well developed authigenic kaolinites need the diagenetic environment which is an open or half-open flow system. This was also favorable for hydrocarbon accumulation. According to the characteristics of diagenesis and pore evolution, the reservior of Middle Xinshanyao Formation can be divided into three diagenetic facies. We evaluated the development of secondary porosity in condition of mutual action of different diagenesis. Besides, depositional condition controls original physical properties of sand, and fractures generated by late tectonization improves the physical properties, all of them control the enrichment of hydrocarbon in this area. These factors are oil storage mechanism of anticlinal reservior in Xinshanyao Formation of Shanle area.
LIU Bei, HUANG Zhi-Long, CHEN Xuan, LI Jie, SHEN Yang . Reservoir Characteristics and Storage Mechanism of Xishanyao Formation in Shanle Area,Tuha Basin[J]. Natural Gas Geoscience, 2009 , 20(5) : 712 -719 . DOI: 10.11764/j.issn.1672-1926.2009.05.712
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