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首页> 美国政府科技报告 >Improvements of Formation Evaluation and Reservoir Engineering in Tight Gas Sands through Selected Core Analysis Procedures. Topical Report, October 1989-December 1991.
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Improvements of Formation Evaluation and Reservoir Engineering in Tight Gas Sands through Selected Core Analysis Procedures. Topical Report, October 1989-December 1991.

机译：选择核心分析程序改善致密气砂岩地层评价和储层工程。专题报告，1989年10月至1991年12月。

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The report describes improvements in formation evaluation in tight gas sands. The research efforts in Task 1 have focused on investigating the effects of natural and stress relaxation microfractures on acoustic velocity and horizontal permeability anisotropy. In these tight gas sands, acoustic anisotropy responded to both natural and induced microfractures, depending on the sample. Research in Task 2 has centered on the laboratory methods of measuring resistivity index on tight gas sand samples. This process is of great importance because the values of saturation exponent, N, which are measured have a large effect on the log calculated water saturation. In Task 3, the authors have cataloged mechanical properties and mineralogical data from core and logs in three East Texas wells, one West Texas well and 3 Frontier formation wells. The data formed the foundation of an exhaustive study of the relationships between core and well log acoustic velocity and between mechanical properties, clay content, and in-situ horizontal stress. The major findings were that the Travis Peak/Cotton Valley and Canyon Sands formations exhibit a strong dependance of acoustic and mechanical properties on clay content, but no such relationship exists for the Frontier formation. Also, it was found that converting dynamic mechanical properties to drained conditions by the method of Biot-Gassman improves the prediction of horizontal stress from well log acoustic velocity measurements.

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