Occurrence of Shale Gas and Prediction of Original Gas In-place(OGIP)
Received date: 2011-01-13
Revised date: 2011-04-11
Online published: 2011-06-10
The key of assessment of shale gas is to evaluate the spatial distribution of original gas in\|place (OGIP) to delineate the core area. The occurrence of shale gas is interim between tight sandstone gas and coalbed gas. Shale gas is composed of free gas in pores,adsorbed gas in the solid organic matter,solution gas in the residual oil and water. Pressure-temperature conditions control the partitioning among three gases and reciprocal transformation. The key controlling free gas,adsorbed gas and solution gas are porosity of shale,amount and maturation of organic matter,amount of residual oil in shale,respectively. The algorithm of free gas,adsorbed gas and solution gas in shale has been designed to quantify the spatial distribution of original gas in-place (OGIP) in the Trinity 3D petroleum system modeling software. Case studies of Barnett shale in the Fort Worth basin are used to show the application of integrated organic maturation,adsorption and PVT simulation to predict the original gas in\|place(OGIP) of shale gas.
WANG Fei-Yu, HE Zhi-Yong, MENG Xiao-Hui, BAO Lin-Yan, ZHANG Hui . Occurrence of Shale Gas and Prediction of Original Gas In-place(OGIP)[J]. Natural Gas Geoscience, 2011 , 22(3) : 501 -510 . DOI: 10.11764/j.issn.1672-1926.2011.03.501
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