Log Interpretation and Evaluation of Hydrocarbon Source Rocks of Xujiahe Formation in the North of Central Sichuan Basin

doi:10.11885/j.issn.1674-5086.2021.09.22.01

Abstract

Abstract: Based on the geochemical experiment results and logging data of source rocks, by fitting the sensitive logging values of geochemical parameters, a reliable logging interpretation model of total organic carbon content and hydrocarbon generation potential is established. At the same time, combined with the actual situation of the study area, the corresponding hydrocarbon source rock classification evaluation standards are formulated, and their plane distribution is preliminarily characterized. The results show that: 1) the source rocks of the Xujiahe Formation in the northern of central Sichuan Basin have high natural gamma, high acoustic transit time, high resistivity, and low compensation density response characteristics on logging curves; 2) the response of acoustic transit time and resistivity curves to the total organic carbon content and hydrocarbon generation potential of source rocks is relatively sensitive. Based on multiple regression between the two and measured geochemical parameters, a more reliable interpretation model for the total organic carbon content and hydrocarbon generation potential of source rocks can be obtained; 3) the total organic carbon content of the source rocks of the Xujiahe Formation in the study area is mostly 0.75% to 1.50%, and the hydrocarbon generation potential is mostly 0.60 mg/g to 1.00 mg/g, mainly composed of poor hydrocarbon source rocksl; 4) vertically, the Xu5 Member is the main source rock development zone of the Xujiahe Formation, followed by the Xu2 Member; Horizontally, the thickness of the source rock in the Xu 5 Member has a trend of thinning from west to east, while the thickness of the source rock in the Xu 2 Member has a trend of thinning from northwest to southeast.

Key words: the north of central Sichuan Basin, Xujiahe Formation, source rock, logging interpretation, source rock evaluation

CLC Number:

TE122

FENG Linjie, JIANG Yuqiang, CAO Jixiang, YANG Changcheng, SONG Linke. Log Interpretation and Evaluation of Hydrocarbon Source Rocks of Xujiahe Formation in the North of Central Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(4): 31-42.

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