基于岩相的致密砂岩差异成岩作用及其储层物性响应

doi:10.11743/ogg20230414

Abstract

Abstract:

An integration of core observation， casting thin section identification， scanning electron microscopy （SEM） observation， porosity-permeability test of samples and mercury intrusion porosimetry （MIP）， in combination with the local burial and hydrocarbon charging history， is applied to the study on the diagenesis， differential lithofacies-based diagenesis mechanism and reservoir pore structure of the Sangonghe Formation in Moxizhuang area， Junggar Basin. The results show that the Sangonghe Formation mainly experienced mechanical compaction， cementation and dissolution during the diagenetic evolution. Reservoirs of diverse lithofacies are significantly different in diagenetic mechanism： the calcareous sandstone facies， argillaceous carbonaceous sandstone facies and volcanic tuffaceous matrix sandstone facies tend to get tight in the early diagenetic stage， while featuring weak diagenesis intensity in the middle stage； the pores of the massive sandstone facies are well preserved in the early diagenetic stage with smooth fluid migration in the middle stage， and there are multi-stage cementation and dissolution occurring in between； and the conglomeratic sandstone and conglomerate facies feature high gravel content， resulting in poor fluid migration， and weak compaction in the early diagenetic stage， while characterized by weak cementation and weak dissolution in the middle stage. The different diagenetic mechanisms for the lithofacies serve to determine the pore structure. The calcareous sandstone facies and argillaceous carbonaceous sandstone facies of lamination texture have poor pore connectivity， complex structure and poor overall physical properties， which are not conducive to oil and gas enrichment； the pore throat of the massive sandstone facies is well sorted， and the pores of the facies are the most developed with strong connectivity， resulting in good overall physical properties， conducive to oil and gas enrichment； the particles of conglomeratic sandstone and conglomerate facies are poorly sorted and in close contact， limiting the pore connectivity to some extent， but the destructive diagenesis intensity is weak， and the overall physical properties are good， conducive to forming effective oil and gas reservoirs.

Key words: differential diagenetic evolution, diagenesis mechanism, pore structure, lithofacies, tight sandstone reservoir, Sangonghe Formation, Moxizhuang area, Junggar Basin

CLC Number:

TE122.2

Hongbo WANG, Cunfei MA, Zheng CAO, Zhipeng LI, Changcheng HAN, Wenming JI, Yi YANG. Differential diagenesis and reservoir physical property responses of tight sandstone based on lithofacies： A case study on the Lower Jurassic Sangonghe Formation in Moxizhuang area， Junggar Basin[J]. Oil & Gas Geology, 2023, 44(4): 976-992.

Figures/Tables 12

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孔隙结构类型	孔隙度/%	渗透率/（10^-3 μm²）	排驱压力/MPa	平均孔径/μm	特征
Ⅰ型	8.1～9.9 （平均8.9）	82.26～160.68 （平均120.24）	<0.1	5.00～10.00	储层孔喉分选性好，粗歪度，喉道类型以片状、弯片状为主，少量缩颈型喉道
Ⅱ型	8.2～10.7 （平均9.1）	1.56～4.72 （平均2.89）	0.1～1.0	1.00～5.00	孔喉分选性中等，略粗歪度，喉道类型以片状、弯片状为主，少量缩颈型喉道
Ⅲ型	4.8～9.2 （平均7.0）	82.26～160.68 （平均120.24）	0.2～1.0	0.10～5.00	孔喉分选性差，细歪度，喉道多为管束状或喉道不发育
Ⅳ型	1.8～8.9 （平均5.1）	0.01～0.31 （平均0.19）	1.0～2.5	0.01～0.10	极细歪度

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Differential diagenesis and reservoir physical property responses of tight sandstone based on lithofacies： A case study on the Lower Jurassic Sangonghe Formation in Moxizhuang area， Junggar Basin

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