利用测井信息计算页岩有机质丰度 ——以川南长宁地区龙马溪组为例

doi:10.3969/j.issn.1673-8926.2016.05.013

Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (5): 107-112.doi: 10.3969/j.issn.1673-8926.2016.05.013

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Using log data to calculate the organic matter abundance in shale：a case study from Longmaxi Formation in Changning area, southern Sichuan Basin

Hu Xi^1，2， Wang Xingzhi^1，3， Li Yizhen⁴， Feng Mingyou ^1，2， Wang Juebo ^1,2

（1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration， Southwest Petroleum University，Chengdu 610500， China； 2. School of Geoscience and Technology， Southwest Petroleum University，Chengdu 610500， China； 3. Sichuan Province Key Laboratory of Natural Gas Geology， Southwest Petroleum University， Chengdu 610500， China； 4. Research institute of Geologic Exploration and Development， CNPC Chuanqing Drilling Engineering Company Limited， Chengdu 610500， China）

Online:2016-09-29 Published:2016-09-29

Abstract

Abstract:

Sufficient organic matter is the material base of hydrocarbon generation. Hence, the potential of hydrocarbon generation highly depends on the organic matter abundance. To obtain accurate organic matter abundance in shale is important for the exploration and development of shale gas. Taking the shale in the lower section of Longmaxi Formation in Changning area in southern Sichuan as an object, and considering TOC content as the evaluating parameter of the organic matter abundance, this paper worked out three calculation formulas for getting TOC content according to the correlation between different well logging data and testing TOC content, then verified the calculation results and analyzed the error. The result shows that the formulas of Δ lg R-DEN method and DEN?U multiple regression method are with larger correlation coefficients and the calculation results coincide well with the TOC content of sample analysis. In single well, at the bottom of the lower section of Longmaxi Formation, the TOC content is higher than that in the upper part and it obviously decreased from bottom to top. The result of DEN?U multiple regression method shows the minimum error and strong adaptability, it can be widely applied in Changning area.

Key words: palaeogeography, sedimentary facies, hydrocarbon exploration direction, Upper Triassic, North China area

Hu Xi， Wang Xingzhi， Li Yizhen，et al. Using log data to calculate the organic matter abundance in shale：a case study from Longmaxi Formation in Changning area, southern Sichuan Basin[J].Lithologic Reservoirs, 2016, 28(5): 107-112.

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