Main Controlling Factors and Densification Periods of the Reservoir Development of Xujiahe Formation Second Member, Western Sichuan
Received date: 2008-07-24
Revised date: 2008-10-23
Online published: 2008-12-10
The second Member of Xujiahe Formation in western Sichuan is the chief pay of natural gas, the main reservoir spaces of which are solution pores, solution cavities and cracks. The reservoirs have extraordinary low porosity and permeability with an average porosity of only 4%. After observation and statistical analyses in lots of slices, the main controlling factors of reservoirs development are sedimentary facies and diagenesis. Sedimentary facies control the reservoir mainly by grain grade and the quartz content, while the diagenesis chiefly affects the reservoir through cementation, dissolution and fractures. Through diagenesis features observation and analyses under microscope, scanning electronic microscope, cathodoluminescence and electron spectrum, the forming sequences of diagenetic minerals are determined; and through statistics of all kinds of cementations, the relative contents of guest minerals, the different periods of residual porosities were quantitatively studied. The reservoir densification period is determined in the Early Middle Yanshan Movement (J2x—J3sn).
YANG Wei ; WEI Guo-qi ;LI Yue-gang ; DUAN Yong; JIN Hui; SHEN Jue-hong; SHI Zhen-sheng ;ZHANG Lin . Main Controlling Factors and Densification Periods of the Reservoir Development of Xujiahe Formation Second Member, Western Sichuan[J]. Natural Gas Geoscience, 2008 , 19(06) : 796 -800 . DOI: 10.11764/j.issn.1672-1926.2008.06.796
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