Well Logging Evaluation of Gas Hydrates in Shenhu Area，South China Sea

Abstract

Abstract:

The wireline logging was applied for recognizing the gas hydrate bearing zone in the drilling of Shenhu area, northern part of South China Sea. Altogether seven instruments which were natural gamma, resistivity, density, full wave sonic, temperature, caliper and neutron logging tools were employed. The main output parameters include GR, Rd(Rs),Den,Vp, temperature, Cali, Neutron counter and borehole orientation. These parameters play a very important role in identifying the depth of gas hydrate reservoir. This paper presented the operating approaches and procedures of logging in Shenhu area in detail. The preliminary evaluation and analysis were also made with the logging data from a drillhole ZK1 in a certain site.The results show good consistent between the porosity derived from density and that from resistivity,while the gas hydrate saturation determined from resistivity is higher than that from pore water analysis, the evaluation may be improved by combining with core data analysis. This study gives a good instruction for future formation evaluation of gas hydrates in China.

Key words: gas hydrate, well logging, reservoir evaluation, Shenhu area, South China Sea

CLC Number:

LU Jing-an,YANG Sheng-xiong,WU Neng-you,ZHANG Guang-xue,ZHANG Ming，LIANG Jin-qia. Well Logging Evaluation of Gas Hydrates in Shenhu Area，South China Sea[J]. Geoscience, 2008, 22(3): 447-451.

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