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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (2): 233-242.doi: 10.11764/j.issn.1672-1926.2021.08.018

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Reservoir characteristics and differential diagenetic evolution process of deep buried sandstone reservoirs： Case study of the upper Es3 in Niuju-Changtan subsag of Eastern Sag， Liaohe Depression

Jiaying YANG1(),Youlu JIANG1(),Guogang CAI2,Chengjin ZHAO1,Dongwei ZHANG2   

  1. 1.School of Geosciences，China University of Petroleum （East China），Qingdao 266580，China
    2.Research Institute of Exploration and Development，Liaohe Oilfield Company，PetroChina，Panjin 124010，China
  • Received:2021-06-09 Revised:2021-08-21 Online:2022-02-10 Published:2022-02-25
  • Contact: Youlu JIANG E-mail:yjyupc521@163.com;jiangyl@upc.edu.cn
  • Supported by:
    The China National Science and Technology Major Project(2016ZX05006?005)

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Abstract:

The deep buried sandstone reservoirs in the upper member of Es3 in Niuju-Changtan subsag of Eastern Sag, Liaohe Depression are characterized by complex sedimentary system, large lateral variation of reservoir and few deep exploration wells, but there is little research on reservoir diagenesis. Based on casting thin-sections, SEM, X-ray diffraction, fluid inclusions and other technical means, this paper analyzed the properties, diagenesis characteristics and evolution of deep sandstone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag, divided the reservoir diagenetic facies types, and compared the differential diagenetic evolution process of different types of reservoirs. The results show that the lithology of the upper third member of Shahejie Formation is mainly medium-fine grained lithic sandstones in the study area with low porosity and ultra-low permeability, and the reservoir pore type is mainly secondary dissolution pores. The diagenetic evolution of reservoir mainly experienced four stages including mechanical compaction for porosity reduction, early cementation for porosity reduction, acidic dissolution for porosity increase and late cementation for porosity reduction. The diagenesis and pore evolution of different types of sandstone reservoirs are significantly different.The densification time of sandstones from tight compaction facies and tight calcite cementation facies is the earliest, followed by sandstones from moderately diagenetic facies, and sandstones from strong dissolution facies are the latest. The sandstones of tight compaction facies and tight calcite cementation facies are affected by high matrix content and high carbonate cementation content respectively, and the porosity decreases rapidly in the early stage of diagenesis, resulting in the limited range and intensity of organic acid dissolution in the late stage. Due to the relatively weak compaction degree in the early stage, the sandstones of strong dissolution facies retain some intergranular pores, which are greatly affected by the dissolution of organic acids, and the reservoir physical properties are improved.

Key words: Reservoir characteristics, Diagenetic facies, Porosity evolution process, Deep sandstone reservoir, Niuju-Changtan subsag

CLC Number: 

  • TE122

Fig.1

Structural position and stratigraphic characteristics in Niuju-Changtan subsag of Eastern Sag"

Fig.2

Triangle diagrams of rock types（a）and lithic types（b）of sandstone reservoirs in the upper third member ofShahejie Formation in Niuju-Changtan subsag of Eastern Sag"

Fig.3

Physical properties of sandstone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

Fig.4

Microscope and SEM images showing reservoir pore type characteristics of sandstone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

Fig.5

Diagenesis types and characteristics of sandstone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

Fig.6

Diagenetic mineral formation time of deep sandstone reservoir in Niuju-Changtan subsag of Eastern Sag based on homogenization temperature of fluid inclusions"

Fig.7

Diagram showing the burial and diagenetic history of sandstone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

Table 1

Classification scheme of diagenetic facies of sand-stone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

成岩程度判别指标IGV/%孔隙体积/%胶结物含量/%
强13>8>10
中等13~155~85~10
弱15<5<5

Fig.8

Diagenetic facies identification diagram of sand-stone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

Fig.9

Types and characteritics of diagenetic facies of sandstone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

Fig.10

Differential porosity evolution and densification process of different diagenetic facies of sandstone reservoirs in the upper third member of Shahejie Formation in Niuju-Changtan subsag of Eastern Sag"

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