Sedimentary and Diagenetic Characteristics of Lacustrine Fine-Grained Hybrid Rock in Paleogene Formation in Dongying Sag

被引：0

作者：

Teng J. ^{[1
,2
,3
,4
,5
]}

Liu H. ^{[6
]}

Qiu L. ^{[1
]}

Zhang S. ^{[2
,3
,4
,5
]}

机构：

[1] School of Geosciences, China University of Petroleum, Qingdao

[2] Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying

[3] Key Laboratory of Shale Oil/Gas Exploration and Production, SINOPEC, Beijing

[4] Laboratory of Sedimentary Simulation and Reservoir Evaluation, Shengli Oilfield Company, SINOPEC, Dongying

[5] Key Laboratory of Productivity Evaluation and Stimulation of Low Permeability Reservoir, Dongying

[6] Shengli Oilfield Company, SINOPEC, Dongying

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2020年 / 45卷 / 10期

关键词：

Calcite; Coevolution; Dolomite; Dongying sag; Hybrid rock; Isotopic; Sedimentation; Shale;

D O I：

10.3799/dqkx.2020.127

中图分类号：

学科分类号：

摘要：

It needs further study on Paleogene lacustrine fine-grained hybrid sedimentary lithofacies type, carbonate isotopic fractionation mechanism and diagenetic evolution in Dongying sag. By core observation, thin section, X-ray diffraction, carbon and oxygen isotopes and other analytical methods, it is considered to be a fine-grained in-situ mixed sedimentary rock, which can be divided into four types of lithofacies: felsic fine-grained hybrid rock and clayey fine-grained hybrid rock, carbonate fine-grained and clayey felsic fine-grained hybrid rock. The analysis of "genetic control layer" shows that the vertical changes of rock mineral composition and paleontological content reflect the supply of source, paleoclimate fluctuation and sedimentary process, which can be used as the identification mark of sequence boundary. Carbon and oxygen isotopic analysis shows that micrite calcite mainly belongs to carbonate related to biogenic gas generated by methane bacteria activity, lenticular and lamellar sparry calcite layers belong to the phenomenon of microcracks being filled by calcite veins, the general buried depth of microcracks and calcite vein formation are the early secondary dry gas generation stage, and sandstone calcite cement is closely related to the generation of mixed vein body. It is further revealed the isotopic fractionation mechanism of micrite and sparry calcite in migmatite, and the whole coevolution process from hydrocarbon generation pressurization, microfracture formation, organic matter thermal evolution to organic acid expulsion, dissolution micrite calcite and calcite recrystallization to calcite vein, which has important guiding significance for the study of shale oil and gas accumulation in middle and deep oil reservoir. © 2020, Editorial Department of Earth Science. All right reserved.

引用

页码：3808 / 3826

页数：18

共 41 条

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