Sedimentary characteristics and exploration potential evaluation of deep shale in continental rift lake:A case study of the third Member of the Shahejie Formation in Banqiao Sag
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摘要:
板桥凹陷沙三段扇体前缘远端—深湖区发育典型陆相断陷湖盆深层页岩层系,本研究旨在查明板桥凹陷深层沙三段页岩沉积特征,厘定页岩油气纵向甜点段,综合评价深层页岩勘探潜力。基于岩心、录井、分析测试等数据,采用地质统计、沉积相与有机地化分析、岩石薄片观察、全岩矿物X衍射、显微CT扫描及地球物理预测等技术,综合剖析页岩的宏观沉积特征和岩石组构类型、层理结构以及微观结构和组成特征,分析其生烃物质基础和成烃条件。结果表明,沙三段页岩层系宏观上可分为混积型、夹层型和互层型3种类型,其中混积型和夹层型分布范围广,岩石发育黑色、深灰色泥岩,为优势岩石组构类型。微观上极薄纹层、薄纹层泥页岩具有较高的有机碳含量,为优势纹层类型。成岩演化分析表明,
3350 m深度以下发育层间水快速排出带、层间水随有机质快速排出带,形成的异常高压利于微观孔隙保存。综合研究表明,板桥凹陷沙三段页岩层系主体已达成熟−高熟阶段,具备油气富集成藏、规模聚集的良好条件,并指明C2,C6甜点段为主要的油气富集段,为页岩油气勘探评价提供了理论支撑。Abstract:Objective Currently, shale oil and gas exploration and development primarily focus on mid-shallow marine and terrestrial depression-type lacustrine basin shales. However, research on the sedimentary characteristics of deep shales in terrestrial rift lacustrine basins remains relatively scarce, and the evaluation of their exploration potential remains unclear. Consequently, this study holds significant practical implications and can provide valuable insights for the exploration and development of deep shales in similar rift lacustrine basins.In the distal part of the fan front and the deep lake area of the Third Member of the Shahejie Formation in the Banqiao Sag, a typical deep shale series in a continental faulted lacustrine basin develops. The aim of this study is to identify the sedimentary characteristics of the deep shale in the Third Member of the Shahejie Formation in the Banqiao Sag, demarcate the vertical sweet spots of shale oil and gas, and comprehensively evaluate the exploration potential of the deep shale.
Method Based on data from core analysis, well logging, and various analytical tests, by employing techniques such as geological statistics, sedimentary facies and organic geochemical analysis, rock thin section observation, X-ray diffraction of whole-rock minerals, micro-CT scanning, and geophysical prediction, the macroscopic sedimentary features, rock fabric types, bedding structures, as well as microscopic structures and compositional characteristics of the shale were analyzed to explore its material basis for hydrocarbon generation and the conditions for hydrocarbon formation.
Result Macroscopically, the shale series of the Third Member of the Shahejie Formation can be classified into three types: mixed sedimentation type, intercalated type, and interbedded type. Among these, the mixed sedimentation type and intercalated type have a wide distribution range. The rocks mainly consist of black and dark gray mudstones, which are the dominant rock fabric types. Microscopically, extremely thin-laminated and thin-laminated mud shales exhibit relatively high organic carbon contents and are the dominant lamination types. The analysis of diagenetic evolution indicates that below a depth of
3350 m, there are zones where interlayer water is rapidly expelled and zones where interlayer water is expelled rapidly along with organic matter. The resulting abnormal high pressure is conducive to the preservation of microscopic pores.Conclusion Comprehensive research shows that the main part of the shale series in the Third Member of the Shahejie Formation in the Banqiao Sag has reached the mature to highly mature stage. It possesses favorable conditions for the enrichment and accumulation of oil and gas on a large scale. Moreover, it is indicated that the C2 and C6 sweet spots are the main zones of oil and gas enrichment, providing theoretical support for the exploration and evaluation of shale oil and gas.The impact of tectonic activities on the generation and accumulation of shale oil and gas has not been adequately considered. Research on shale formations is still in its early stages, and numerous issues remain that require in-depth investigation. It is essential not only to elucidate the material basis for the occurrence of shale oil and gas but also to identify the key factors influencing their production. Therefore, future efforts should focus on achieving technical breakthroughs in the field of integrated geological and engineering approaches.
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图 6 板桥凹陷沙三段混积型页岩层系取心段岩性组合特征
a. B121X1井,
3990.71 ~3991.03 m,泥质粉砂岩,底部发育砂砾岩,见撕裂状泥岩;b. B121X1井,3994.05 m,泥页岩,纹层发育,见裂缝;c. B1711井,5219.54 m,细砂岩,发育平行层理;d. B1711井,5222.80 m,粉砂质泥岩,发育韵律层理;e. B1711井,5222.92 m,粉砂质泥岩,发育同沉积变形构造;f. B1711井,5226.40 m,深灰色泥岩,夹粉砂质团块Figure 6. The lithological composition characteristics of the core sections from shale series of the mixed sedimentation type of the Third Member of the Shahejie Formation in the Bangqiao Sag
图 9 沙三段页岩层系岩石薄片显微特征照片
a. B121X1井,
3994.80 m,单偏光显微薄片(10x(显微镜放大倍数为10倍,下同)),含泥粉砂岩,粉砂主要为粗粉砂,粉砂与泥质呈互层状; b. B121X1井,3994.80 m,荧光显微薄片,颗粒见灰蓝黄褐色荧光,亮度中暗;岩石微裂缝见灰蓝色荧光,亮度中暗;c. B121X1井,3996.52 m,单偏光显微薄片(10x),泥岩,少量长英质细粉砂、粉晶碳酸盐颗粒均匀分布;d. B121X1井,3996.52 m,荧光显微薄片,泥质微层见灰蓝褐色荧光,亮度暗;e. B121X1井,3992.89 m,场发射扫描电镜图片;f. B121X1井,3994.71 m,场发射扫描电镜图片;g. Bs35井,4114.00 m,单偏光显微薄片(10x),细粒岩屑长石砂岩,细砂状结构,见少量粉砂和中砂,颗粒分选中等,磨圆中等,压实强烈;h. Bs35井,4122.42 m,单偏光显微薄片(10x),细粒长石岩屑砂岩,发育微裂缝Figure 9. Microscopic photos of rock thin sections from shale series of the Third Member of the Shahejie Formation
图 15 板桥凹陷沙三段页岩气成藏模式图[44]
Figure 15. Model diagram of the Shale gas accumulation from the Third Member of the Shahejie Formation in the Bangqiao Sag
表 1 沙三段混积型页岩层系泥页岩和砂岩孔隙空间数据表
Table 1. Table of Pore Space Data of the mudstones and sandstones from shale series of the mixed sedimentation type of the Third Member of the Shahejie Formation
深度/m 岩相 平均配位数 迂曲度 孔隙度/% 有效孔隙度/% 裂缝孔隙度/% 裂缝贡献率/% 3990.24 砂泥混杂 0.2 6.11 1.7 0.55 0.39 23.2 3992.89 薄纹层 0.35 2.93 5.44 0.87 0.32 5.91 3994.71 极薄纹层 0.54 4.56 2.56 0.64 0.32 12.54 3996.56 中纹层 0.24 4.59 2.37 0.4 0 0 -
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