Paleoenvironment and chemostratigraphy heterogenity of the Cretaceous organic-rich shales

• DOI: 10.46690/ager.2021.04.09
• Publication Date: 2021-12-25T04:33:05Z
• Authors: Modi Guan; Songtao Wu; Lianhua Hou; Xiaohua Jiang; Dan Ba; Ganlin Hua
• Keywords: Chemostratigraphy

The Cretaceous Qingshankou Formation in the Songliao Basin is rich shale oil resources, which has become one of most important exploration targets lacustrine China. Based on X-ray fluorescence element analysis, diffraction total organic carbon, rock pyrolysis, scanning electron microscope and nitrogen adsorption, Paleoenvironment was reconstructed by comprehensive utilization integrated prediction error filter analysis chemical stratigraphy, its relationship with geochemistry, mineralogy pore structure discussed. results indicated that deposited environment fresh water-brackish water, semi-deep/deep water strong reduction. evolution during deposition changed from bottom to top, increasing depth, decreasing salinity oxygen content. Paleosalinity positively correlated residual hydrocarbon carbonate mineral From contents chlorite decreased, while plagioclase clay minerals increased slightly. pores were dominated intra-illite pores, intra-I/S mixed-layer intra-pyrite pores. Some intra-plagioclase calcite dissolution developed, matter are slightly few. Nitrogen adsorption data showed dominate size 40-53 nm. This study clarifies Paleoenvironmental Formation, may shed lights accumulation sweet-spotting. Cited as : Guan, M., Wu, S., Hou, L., Jiang, X., Ba, D., Hua, G. chemostratigraphy heterogenity organic-rich shales. Advances Geo-Energy Research, 2021, 5(4): 444-455, doi: 10.46690/ager.2021.04.09