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Wang X.,Shandong University of Science and Technology | Wang X.,Key Laboratory of Sedimentary Basins and Oil & Gas Resources | Mu C.,Key Laboratory of Sedimentary Basins and Oil & Gas Resources | Mu C.,Chengdu Institute of Geology and Mineral Resources | And 2 more authors.
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2013

Based on microscopic observations, fluid inclusions and thermodynamic analyses of various diagenetic reactions in acidic and alkaline fluid media, and combined with evolutionary history of organic matter and burial history, diagenetic evolution and facies of reservoirs in Member 8 of Xiashihezi Formation in the Z30 block of Sulige Gasfield were classified. The result showed that the Member 8 of Xiashihezi Formation reservoirs experienced at least four evolutionary stages of diagenesis, namely the syndiagenetic to early Period A of Early Diagenesis weak-acid corrosion stage, the late Period A to Period B of Early Diagenesis acid corrosion stage, the Period A to early Period B of Middle Diagenesis acid dissolution stage, and finally the late Period B of Middle Diagenesis to epigenetic alkaline metasomatism and cementation stage. The epigenetic stage emerged during the uplift of the study area. After the diagenetic evolution, five types of diagenetic facies were formed in this area, i.e, unstable component dissolution-chlorite film facies of arenite, unstable component dissolution-kaolinite and siliceous cementation facies of arenite, kaolinite and siliceous cementation-unstable component dissolution facies of arenite, unstable component dissolution-carbonate dense cementation facies of arenite, and miscellaneous matrix-filled dense compaction facies of greywacke. The acid dissolution stage is a critical period for the formation of main reservoir space, which makes the unstable component dissolution-chlorite film facies of arenite, the unstable component dissolution-kaolinite and siliceous cementation facies of arenite and the kaolinite and siliceous cementation-unstable component dissolution facies of arenite as the constructive diagentic facies of reservoirs. Source


Wang X.,Shandong University of Science and Technology | Wang X.,Key Laboratory of Sedimentary Basins and Oil & Gas Resources | Mou C.,Key Laboratory of Sedimentary Basins and Oil & Gas Resources | Mou C.,Chengdu Institute of Geology and Mineral Resources | And 10 more authors.
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2015

Based on 33 outcrop profiles and one-well coring data in combination with microscope, back scattering, scanning electron microscope, X-ray diffraction and other analytical methods, the relationship between mineral component and total organic content (TOC) of black rock series in the lower Longmaxi Formation in Southern Sichuan and its periphery is figured out. The research indicates that mineral components have a certain influence on TOC. The TOC of siliceous shale is maximum, followed by clayey shale; that of carbonate shale is least. In the study area, siliceous shale is most developed; the origin of quartz and clay minerals are dominated by biogenesis and clastogene; carbonate minerals are mainly authigene. Based on the distribution characteristics of organic matters, the possible distribution areas of shale gas are predicted according to the basic evaluation criteria of mineral component in favorable hydrocarbon source rocks. The vast area from Suijiang northeastward to Shizhu is most favorable area for shale gas, in which Wulong-Pengshui region (I1), Chishui-Xishui Region (I2), Longchang-Yongchuan Region (I3) and Suijiang-Shuifu Region (I4) are favorable blocks; Changning-Xuyong (II) is a secondarily favorable area. ©, 2015, Science Press. All right reserved. Source

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