TOC Calculation and the Screening of Favorable Layers in the Marine Mud Shale in the Tarim Basin
Received date: 2014-06-01
Revised date: 2014-07-29
Online published: 2015-05-10
The Tarim Basin develops several layers of marine shale which have large potential for shale gas resources.Based on large quantities of measured data,the TOC of marine shale was calculated by using logging method.Based on outcrop sample analysis,the favorable shale layers which are rich in organic matters were screened and determined.The classic ΔlogR method is not fit for the TOC calculation of high-over mature shale,while the TOC calculation by using Uranium logging curve works well.The results show that the organic-enriched shale in the Tarim Basin mainly distributes in the Middle-Lower Ordovician Heituwa Formation,the Lower Cambrian Xidashan-Xishanbulake Formation in eastern Manjiaer Depression,and the Middle-Upper Ordovician Saergan Formation in the Keping-Awati Depression area.The Heituwa shale in Tadong area is a favorable layer for the present shale gas exploration,however,considering its small distribution area and shale thickness,it has a small potential for the exploration and development of shale gas.
Key words: Shale gas; Marine shale; ΔlogR; Uranium logging curve; Tarim Basin
CHEN Ke-tong,LU Xue-song,LIU Hua,TIAN Hua,WANG Xi-han,ZHANG Bao-shou,ZHANG Ke . TOC Calculation and the Screening of Favorable Layers in the Marine Mud Shale in the Tarim Basin[J]. Natural Gas Geoscience, 2015 , 26(5) : 942 -950 . DOI: 10.11764/j.issn.1672-1926.2015.05.0942
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