Abstract
The main productive zones of EHWJA carbonate gas field groups consisting of 5 gas fields, which are located in eastern area on the Right Bank of the Amu Darya River, Turkmenistan, include XVhp, XVa1, and XVa2, and their physical properties from core data indicate low porosity and permeability. However, it is a factor proved from some data such as core, FMI/XRMI log, and production dynamic data, that reservoir fractures have significant impact on productivity, which are controlled by reservoir lithology/rock types. Due to different kinds of lithologies, complicated pore types and structure, it is a challenge to effectively identify lithology/rock types and to further establish the relationship between them. The paper firstly focuses on comprehensive analysis of log responses and criteria establishment of log identification for different lithologies and rock types from integration data of core, conventional and FMI/XRMI wire-line logs, and master-log; then following analysis process of core– FMI/XRMI– conventional wire-line logs, the important studies have been finished on the relations of fracture densities versus lithologies/rock types, and significant log parameters including Gamma ray (GR), Deep laterolog resistivity (LLD), Deep and Shallow laterolog resistivity ratio (LLD/LLS), Sonic wave time (DT). The results indicate that: (1) Fractures are obviously related to lithologies/rock types, which are characterized as: fractures develop in dolomite, silty limestone, and micritic-silty limestone intervals, and are next in micritic limestone intervals, and hardly develop in argillaceous limestone and shalestone intervals; (2) The log responses of fracture densities increasement show reducing GR, LLD, and LLD/LLS, and increasing DT; (3) Generally speaking, fractures strongly develop in silty limestone and micritic-silty limestone intervals of XVhp, and in dolomite intervals of XVa2. The above results are helpful in technical support for the predictions of favorable reservoirs and productivity distribution. The research findings are important meanings for the development of the same types of gas fields.
Copyright 2019, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in Xi’an, China, 16–18 October, 2019.
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The project was supported by the National Science and Technology Major Project (Grant No. 2016ZX05029005). We thank the anonymous reviewers and the editors for their constructive comments and suggestions, which improved the manuscript.
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Zhu, Hq., Xing, Yz., Zhang, Lj., Li, M. (2020). Impact of Lithology/Rock Types on the Fracture of a Complicated Carbonate Gas Reservoir with Low Porosity and Permeability—A Case Study of EHWJA Gas Field Groups. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2019. IFEDC 2019. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-2485-1_11
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