页岩气成藏主控因素与成藏模式研究:以渝东南地区五峰组-龙马溪组为例
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摘要
渝东南地区地处四川盆地东南缘,前人研究表明其五峰组-龙马溪组具有较好的页岩气成藏地质条件,但对其页岩气成藏的主控地质因素不同学者有不同的认识,对其成藏模式则少见报道。通过对该地区3口单井的储层有机地球化学资料、物性测试资料及现场解吸含气量数据进行了分析,发现储层的含气量跟储层物性之间没有明显的相关性,而主要与总有机碳含量呈良好的正相关关系,表明总有机碳含量是该地区五峰组-龙马溪组页岩气富集成藏最关键的控制因素。通过该地区某三维地震工区叠后流体检测与裂缝预测技术,发现平缓构造区的页岩气聚集主要呈顺层分布,并主要聚集在五峰组和龙马溪组中下部总有机碳含量较高的部位,与裂缝发育之间没有明显的相关性;但在靠近背斜轴部、应力集中的地区,裂缝发育与页岩气藏的分布具有较好的吻合性。最后提出渝东南地区五峰组-龙马溪组具有3种成藏模式类型,即:原地型成藏模式、裂缝型成藏模式及原地-裂缝型成藏模式。
Southeastern Chongqing located in the southeastern area of Sichuan Basin,where the WufengLongmaxi formations has good geological condition for shale gas accumulation.While the main control factors for shale gas accumulation are widely studied,different scholars have different ideas;and the accumulation models receive little research.Through the analysis of organic geochemical data,physical testing data and field desorption gas content data of the three wells in this area,indications show that there is no significant relationship between the gas content and the reservoir physical property,while the gas content has agood positive correlation with the total organic carbon(TOC)content.This means that TOC content is the most important control factor for shale gas accumulation of Wufeng-Longmaxi formations in southeastern Chongqing.Through the fluid detection and fracture prediction by the post stack technique of a 3D seismic area,the shale gas accumulation is mainly bedding distribution in the gentle strata,and concentrated in the lower and middle part of the Wufeng-Longmaxi formations where with high TOC content,but has no significant relationship with the fracture distribution.While near the anticlinal axis,the stress concentration area,the shale gas accumulation has a good relationship with the fracture distribution.Finally,it is concluded that there are 3accumulation models for the formation:the layer controlling model in place;the fracture controlling model and the layer with fracture controlling model.
引文
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