|Table of Contents|

Diagenesis and Reserving Space Characteristics of Tight Oil Reservoirs of Permian Lucaogou Formation in Jimusar Sag of Junggar Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第03期
Page:
253-266
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Diagenesis and Reserving Space Characteristics of Tight Oil Reservoirs of Permian Lucaogou Formation in Jimusar Sag of Junggar Basin, China
Author(s):
CAO Ying-chang1; 2;  ZHU Ning1;  ZHANG Shao-min1;  XI Ke-lai1;  XUE Xiu-jie1
(1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 2. Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, Shandong, China)
Keywords:
tight oil reservoir;  diagenesis;  reservoir space;  physical property;  diagenetic difference;  Lucaogou Formation;  Jimusar sag;  Junggar Basin
PACS:
P618.13
DOI:
-
Abstract:
The core observation, casting and fluorescence thin section authentication, combined with confocal laser scanning microscope(CLSM), scanning electron microscope(SEM), X-ray diffraction and rate-controlled mercury intrusion, were employed to characterize tight oil reservoir space properties of Permain Lucaogou Formation in Jimusar sag of Junggar Basin, China, aiming at analyzing the diagenesis, reservoir space and relationship between them. The results show that tight oil reservoir of Lucaogou Formation in Jimusar sag is mainly composed of carbonate, terrigenous detrital, pyroclastic and normal mixed sedimentary rocks, and the reservoir spaces include secondary solution pores, intercrystalline pores and microcracks; the different types of rock undergo different diagenesis processes and develop different reservoir spaces. ①In the carbonate rocks, micritic dolostones are characterized by single component, severe compaction and weak cementation, and the reservoir space is dominated by dolomite intercrystalline pores; with the increasing of silty and tuffaceous contents, the silty arenites and tuffaceous dolostones are characterized by weaker compaction, stronger dissolution and cementation, and the reservoir space is mainly composed of feldspar inner pores, mold holes and tuffaceous dissolution pores. ②In the terrigenous detrital rocks, tuffaceous siltstones are characterized by moderate compaction, and widespread dissolution of feldspar and dispersive tuffaceous, the dissolution pores are filled by a great amount of clay mineral, and the reservoir space is mainly composed of honeycomb feldspar dissolution pores and tuffaceous dissolution pores; the dolomitic mudstones are characterized by strong compaction and poor dissolution, and intercrystalline pores and microcracks can be observed in it. ③In pyroclastic rocks, the characteristics of silty and dolomitic tuffites are similar to those of tuffaceous siltstones, but the kinds of cement are a lot, the main reservoir spaces are secondary dissolution pore with a few intercrystalline pores.

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Last Update: 2019-05-20