Genetic mechanisms of low-resistivity gas zones in structure A of sag X

CHENG Ren-Jie; SUN Jian-Meng; LIU Jian-Xin; CHI Peng; Lyu Xin-Di; HU Wen-Liang; FU Yan-Xin; ZHAO Wen-BING

doi:10.11720/wtyht.2022.1416

2022 Vol. 46, No. 6

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Article navigation > Geophysical and Geochemical Exploration > 2022 > 46(6): 1369-1380

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CHENG Ren-Jie, SUN Jian-Meng, LIU Jian-Xin, CHI Peng, Lyu Xin-Di, HU Wen-Liang, FU Yan-Xin, ZHAO Wen-BING. 2022. Genetic mechanisms of low-resistivity gas zones in structure A of sag X. Geophysical and Geochemical Exploration, 46(6): 1369-1380. doi: 10.11720/wtyht.2022.1416

Citation:

CHENG Ren-Jie, SUN Jian-Meng, LIU Jian-Xin, CHI Peng, Lyu Xin-Di, HU Wen-Liang, FU Yan-Xin, ZHAO Wen-BING. 2022. Genetic mechanisms of low-resistivity gas zones in structure A of sag X. Geophysical and Geochemical Exploration, 46(6): 1369-1380. doi: 10.11720/wtyht.2022.1416

Genetic mechanisms of low-resistivity gas zones in structure A of sag X

1. School of Geoscience, China University of Petroleum (East China), Qingdao 266580, China；
2. CNOOC China Limited, Shanghai Branch, Shanghai 200335, China；
3. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China

Received Date: 02 August 2021

Revised Date: 20 December 2022

Publish Date: 03 January 2023

Abstract

Abstract

As confirmed by exploration and development, many low-resistivity gas zones exist in the upper portion of layer Q3c of the H Formation in structure A of Sag X. Given the problems such as unclear understanding of the geological sedimentary environment, insufficient microcosmic knowledge about the reservoirs, and unclear causes of the low resistivity of the gas zones, this study conducted extensive research based on the log data of three wells in the study area, as well as the data on drilling and many petrophysical experiments. Specifically, the petrological and physical property characteristics of the study area were studied using the thin-section identification data; the genetic mechanisms of low-resistivity gas zones were studied using the well tie sections and the special log data, as well as the data of many petrophysical experiments; the formation mechanisms of low-resistivity gas zones were confirmed from the microscopic visualization scale by constructing a multi-component conductivity model using the digital core technique, and the contributions of various low-resistivity geneses to the decrease in resistivity were quantitatively analyzed through the finite element-based electrical simulations. As indicated by the study results, the low-resistivity response of the gas zones in the study area is caused by the presence of clay minerals with high clay content and high cation exchange capacity and also results from the complex pore structure formed under the favorable physical property conditions in the anomalous high-pressure depositional setting. The contributions of the clay additional conductivity and the complex pore structure to the low resistivity are 35.63% and up to 64.37%, respectively. The electrical simulation results are consistent with the log-derived electrical characteristics, verifying the genetic mechanisms of the low-resistivity gas zones in the upper portion of the Q3c.
- low-resistivity gas zone /
- clay additional conductivity /
- pore structure /
- digital core /
- electrical simulation

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References

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