Multi-source genesis of continental carbonate-rich fine-grained sedimentary rocks and hydrocarbon sweet spots

JIANG Zaixing,KONG Xiangxin,YANG Yepeng,ZHANG Jianguo,ZHANG Yuanfu,WANG Li,YUAN Xiaodong

Fig. 6. Reservoir spaces and hydrocarbon accumulation in the “sweet spot” of endogenous type. (a) Well ST1H, 4 209.30 m, the Es3L of Shulu Sag, intercrystalline and intracrystalline pores in calcite[42]; (b) Well NY1, 3 464.89 m, the Es4U of Shulu Sag, interlaminar fractures between sparry calcite laminae; (c) Well ST1H, 4 207.89 m, the Es3L of Shulu Sag, organic matter-rich laminae[4]; (d) Well BY1, 3 126.32 m, lower part of the Eq3 of Qianjiang Sag, with scattered organic matter[4]; (e) Well FY1, 3 182.69-3 183.69 m, the Es3L of Dongying Sag, rhythmic laminated marlstone and rhythmic laminated marlstone with sparry calcite laminae, red arrows indicating the potential direction of hydrocarbon migration.