Diagenetic Evolution and Controlling Factors of Deepseated Clastic Rocks in Terrestrial Fault-depressed Basin：Taking the Kongdian Formation of Dongying Fault-depressed Basin for Example

Abstract

Abstract:

Based on the analysis of thin-section analysis, scan electricity microscope observation,vitrinite reflectance,X-diffraction and physical quality analysis,the diagenetic evolution and controlling factors of Kongdian Formation in Dongying sag have been detailly researched. It is indicated that the typical diagenetic phenomenon include the intensive compaction,anhydrite cementation,multiperiod carborate cementation, multiperiod clay minerals cementation, intensive siliceous cement，intensively interpenetration replacement between minerals,solution of clastic and cementation. The conclusion has been verified that compaction is the main cause of high pyknosis of the deep-seated clastic rocks, another cause is the cementation of anhydrite, carborate and siliceous. Solution of feldspar and carbonate cementation are the main diagenetic cause of improving the reservoir. Diagenetic evolution experiences the penecontemporaneousmiddle diagenetic stage B,part of it reaches the late diagenetic stage. The diagenetic evolution controls the pore evolution. It has been discussed that ariditysemiarid depositional environment,locating surface variation,deep-burial,and tectonic-magma activity are the key factors of controlling the diagenetic evolution and pore evolution.

Key words: deepseated clastic rock, diagenetic mineral, diagenetic evolution, controlling factor, Kongdian Formation, fault-depressed basin;Dongying

CLC Number:

TE122.2

TAN Xian-Feng, TIAN Jing-Chun, LIN Xiao-Bing, ZHANG Shou-Peng. Diagenetic Evolution and Controlling Factors of Deepseated Clastic Rocks in Terrestrial Fault-depressed Basin：Taking the Kongdian Formation of Dongying Fault-depressed Basin for Example[J]. Geoscience, 2010, 24(5): 934-944.

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