成岩流体系统演化阶段与深层超压致密储层成因——以准噶尔盆地腹部地区为例

doi:10.11743/ogg20250513

Abstract

Abstract:

Deep overpressured tight hydrocarbons represent a significant resource type for additions to reserves from reserve growth in the Junggar Basin. This study aims to determine the origin and primary controlling factors of tight reservoirs in the hinterland of the basin. Based on data from laboratory tests of reservoirs， drilling and logging， and well tests， combined with basin simulation results and integrated geological interpretation， we characterize mechanical and chemical compaction processes in the reservoirs and determine the temporal evolution of overpressure development. By examining the formation mechanisms of the semi-closed to closed diagenetic fluid system， we further reveal the genetic mechanisms and primary controlling factors of deep overpressured tight reservoirs in the hinterland of the Junggar Basin. The results indicate that at burial depths ranging from 0 to 2 400 m， the reservoirs are predominantly subjected to mechanical compaction， which induces porosity reduction rates of up to 70% ~ 90% and the formation of a semi-closed to closed diagenetic fluid system. At burial depths of greater than 2 400 m， chemical compaction predominates， with dissolution products mostly precipitating in situ or nearby as cements since their migration is significantly hindered. This results in limited dissolution-induced porosity enhancement in the absence of other constructive diagenetic processes. Overpressure originating from different mechanisms enhances reservoir quality to varying degrees. Specifically， overpressure induced by chemical compaction plays a minor role in preserving primary pores and forming secondary pores. In contrast， overpressure formed by hydrocarbon generation and pressure transmission can intensify dissolution， thereby improving reservoir physical properties. Overall， the degree of openness of the diagenetic fluid system， determined by early-stage mechanical compaction， plays a significant role in controlling the diagenetic evolutionary pathway， the evolutionary pattern of pores， and the formation of high-quality reservoirs （sweet spots） during late-stage deep burial stage.

Key words: diagenetic fluid system, compaction, genetic mechanism, overpressure, tight sandstone reservoir, Junggar Basin

CLC Number:

TE122.2

Jun LI, Chengzhuo YUAN, Xiaoqing SHANG, Tao WU, Maimaitimin WUERNISAHAN, Chenhang XU, Zeyang XU, Huiyong XU. Diagenetic fluid system evolution and genesis of deep overpressured tight reservoirs： A case study of the hinterland of the Junggar Basin[J]. Oil & Gas Geology, 2025, 46(5): 1597-1613.

Figures/Tables 12

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Diagenetic fluid system evolution and genesis of deep overpressured tight reservoirs： A case study of the hinterland of the Junggar Basin

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