Three typical types of shale gas preservation in the Fuling Shale Gas Field, Sichuan Basin

被引：0
|
作者：
Shu Y. [1 ]
Lu Y. [1 ]
Bao H. [2 ]
Wang C. [2 ]
Liu Z. [1 ]
机构：
[1] Faculty of Earth Resource, China University of Geosciences(Wuhan), Wuhan, 430074, Hubei
[2] Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan, 430223, Hubei
来源：
| 2018年 / Natural Gas Industry Journal Agency卷 / 38期
关键词：
Early Silurian; Evaluation index; Fuling Shale Gas Field; Late Ordovician; Shale gas; Sichuan Basin; Single-well testing production; Structural type; Type of preservation;
D O I：
10.3787/j.issn.1000-0976.2018.03.004
中图分类号：
学科分类号：
摘要：
The primary quality of shale in the Fuling Shale Gas Field, Sichuan Basin, is areally less different, but the gas production rates vary greatly from different development wells. This is resulted from the areal difference of shale gas preservation conditions. For a quantitative evaluation of shale preservation conditions in this area, the structural characteristics of this field (e.g. the force applied on the structure, and structural form and fracture development degree) were analyzed comprehensively and the structural types were classified based on the detailed structure interpretation results, together with geological, well logging and gas well testing data. Then, based on the single-well testing production of shale gas, the main indexes influencing the preservation conditions of marine shale gas of the Upper Ordovician Wufeng-Lower Silurian Longmaxi Fms in this area were studied from the macroscopic and microscopic aspects. And finally, the preservation types were classified according to the determined evaluation indexes. The following research results were obtained. First, the structures in the Fuling Shale Gas Field can be divided into a stable type, a weakly-deformed type and a complex type. Second, the following 6 parameters are taken as the evaluation indexes of shale gas preservation conditions in this area, including structural form, fracture characteristic, roof and floor condition, formation pressure, porosity and pore size. Third, gentle morphological structures and major structures far from the boundary are the base of shale gas preservation. The effective barrier and roof & floor sealing can significantly reduce the damage of structural reworking to gas reservoirs. Overpressure environment, porosity and pore size are the comprehensive representations of preservation conditions. And fourth, three types of structures correspond to three typical types of shale gas preservation respectively, among which a stable structure is the most favorable one. © 2018, Natural Gas Industry Journal Agency. All right reserved.
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页码：31 / 40
页数：9
相关论文
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