四川盆地涪陵页岩气田3种典型页岩气保存类型
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摘要
四川盆地涪陵页岩气田页岩原生品质平面差异性小,但开发井的产气量却差异较大,有分析认为这是页岩气保存条件平面差异变化所致。为了定量评价该区页岩气的保存条件,以构造精细解释成果为基础,综合地质、测井、气井测试等资料,对该页岩气田构造受力强弱、构造形态、断裂发育程度等构造特征进行了综合分析和构造类型划分;结合页岩气单井测试产量,从宏观—微观两个方面对影响该区上奥陶统五峰组—下志留统龙马溪组海相页岩气保存条件的主要指标进行了研究,并据所确定的评价指标划分了页岩气保存类型。结果表明:(1)该页岩气田构造类型可划分为稳定型、弱变形型和复杂型3种;(2)优选构造形态、裂缝特征、顶底板条件、地层压力、孔隙度、孔径大小等6项参数作为该区页岩气保存条件的评价指标;(3)构造形态平缓、远离边界主控断裂是页岩气得以保存的基础,顶底板有效的隔挡封闭条件可显著降低构造改造对气藏的破坏作用,超压环境、孔隙度和孔径大小是保存条件的综合表象;(4)3种构造类型分别对应于3种典型的页岩气保存类型,其中构造稳定型为最有利的保存类型。
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.
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.
引文
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