Distribution Patterns of Calcite Cement in the Turbidite Sandstones of the Shahejie Formation in the Dongying Depression,Eastern China

作     者：ZHANG Yongwang QU Zhengyang ZHANG Yongwang;QU Zhengyang

作者机构：State Key Laboratory of Petroleum Resources and ProspectingBeijing 102249China College of GeosciencesChina University of Petroleum-BeijingBeijing 102249China No.4 Oil Production PlantPetroChina Changqing Oilfield CompanyYinchuan 718500China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2022年第96卷第3期

页      面：1041-1056页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

基　　金：funded by the National Natural Science Foundation of China (Grant No. 41572113) 

主　　题：turbidite sandstone calcite cement distribution patterns Dongying Depression 

摘      要：Calcite cements are volumetrically dominant among the most diagenetic constituents in turbidite sandstones of the Paleogene Shahejie Formation in the Dongying *** results show carbonate cements mainly occur in three phases:Calcite I(pre-compaction),Calcite II(post-compaction)and ankerite in the turbidite *** isotopic composition of Calcite I and Calcite II range from−4.3‰to 4.4‰,−3.5‰to 4.3‰PDB,respectively,suggesting that the calcite cements are mainly derived from the interbedded *** early calcite cement precipitated from the mixing of lacustrine and meteoric waters at 38-69℃.The late-phase calcite precipitated from pore waters modified by water-rock interactions at 64-126℃.Two distribution patterns of calcite cements can be identified,depending on their position within the *** peripheral cementation of the sandstones is near the sand-shale *** development of cement is controlled by sandstone thickness and the properties of the interbedded *** scattered cementation,the distribution of the calcite cement is not controlled by the sand-shale *** cement was preferentially distributed in coarse-grained sandstones,indicating that sandstones with high original permeability are the preferred pathway for the migration of early diagenetic fluids.