油气藏评价与开发 >
2021 , Vol. 11 >Issue 1: 47 - 55
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2021.01.007
基于地层水指标的页岩气保存条件评价——以渝东南地区五峰组—龙马溪组页岩气藏为例
收稿日期: 2020-06-28
网络出版日期: 2021-02-04
基金资助
国家自然科学基金“四川盆地五峰组—龙马溪组页岩气储层演化机理及评价方法”(41872124);国家自然科学基金“四川盆地及周缘龙潭组海陆过渡相页岩复杂有机质孔隙发育机制”(41972132);国家自然科学基金“中国南方寒武系页岩有机质、流体和孔隙演化耦合机制研究”(41730421)
Evaluation of shale gas preservation conditions based on formation water index: A case study of Wufeng-Longmaxi Formation in Southeastern Chongqing
Received date: 2020-06-28
Online published: 2021-02-04
四川盆地及其周缘五峰组—龙马溪组页岩气勘探开发已取得较好成果,但不同井位之间页岩含气量差异大。通过对渝东南地区PY1HF、JY1HF、NY1HF、LY1等井位地层水的矿化度、地化指标、水型等分析后认为：CaCl2水型反映较好的页岩气保存条件,NaHCO3和Na2SO4水型反映地层水与大气水有不同程度的贯通,保存条件相对较差。基于渝东南地区发育的大型断裂和残留向斜构造及五峰组—龙马溪组地层水特征,将其地下水渗流方式对应划分为大型断裂发育区地层水下渗型和残留向斜区地层水向心流型两种类型,分别对应不同的页岩气保存条件。大型断裂发育的地区,地表水沿断裂下渗深度较大,对页岩气藏破坏较大,多表现为微含气或不含气状态;残留向斜区地层水向心流型,向斜深部保存条件相对较好。在向斜边缘地表水与地层水形成自由交替带,页岩气藏的保存条件较差,因而含气性较差,而越靠近核部地区受大气水下渗影响越弱,保存条件越好。
张光荣 , 聂海宽 , 唐玄 , 张培先 , 彭勇民 . 基于地层水指标的页岩气保存条件评价——以渝东南地区五峰组—龙马溪组页岩气藏为例[J]. 油气藏评价与开发, 2021 , 11(1) : 47 -55 . DOI: 10.13809/j.cnki.cn32-1825/te.2021.01.007
Significant progress has been made in the exploration and development of shale gas in the Wufeng-Longmaxi Formation of Sichuan Basin, but shale gas content varies greatly among different well locations. Through the analysis of formation water salinity, geochemical index and formation water type in Well-PY1HF, Well-JY1HF, Well-NY1HF, Well-LY1 and other wells in Southeastern Chongqing, it is found that CaCl2 water type reflects good shale gas preservation conditions, while the water types of NaHCO3 and Na2SO4 reflect formation water and atmospheric water are interconnected to different extent, leading to a relatively poor preservation condition. Based on the characteristics of large-scale faults and residual syncline structures developing in Southeastern Chongqing and the formation water characteristics of Wufeng-Longmaxi Formation, the groundwater seepage mode can be divided into two types: the infiltration type in the large-scale fault development area and the centripetal flow type in the residual syncline area, corresponding to different shale gas preservation conditions. In the area with large-scale faults, the surface water infiltrates deeply along the faults, causing great damage to shale gas reservoir, most of them contain few gases. The formation water in the residual syncline is centripetal flow, and the deep part of the syncline is relatively well preserved. The surface water and the formation water form a free alternating zone at the syncline edge, and the preservation condition of shale gas reservoir is poor, thus the gas bearing property is poor. In the core part of the syncline, the closer to the core part, the weaker the influence of atmospheric water infiltration is, and the better the preservation condition will be.
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