| Citation: | MENG Yujing，LUO Yang，ZHAO Yanchao，et al. Structural diagenesis and reservoir control analysis of tight sandstone in the strike-slip fault zones of the Chang 8 to Chang 6 Members in the Jinghe Oilfield[J]. Bulletin of Geological Science and Technology，2025，44（1）：74-89 doi: 10.19509/j.cnki.dzkq.tb20230447
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The distribution of tight sandstone sweet spots in the Chang 8 to Chang 6 members of the Jinghe Oilfield is primarily influenced by strike-slip fault zones and their internal structural patterns, which demonstrate significant heterogeneity. This finding indicates that tectonic diagenesis is the main controlling factor of reservoir heterogeneity.
This paper integrates various datasets to analyze structural diagenesis and reservoir formation within fault zones, thereby providing a foundation for the efficient development of tight sandstone reservoirs.
Variations in structural stress and strain lead to differing structural diagenesis and reservoir characteristics between and within strike-slip fault zones. The key findings include the following: (1) The structural stress and strain in strike-slip fault zones show clustered distribution characteristics. The zones are categorized into high-stress–strain zones (HSSZs) and low-stress–strain zones (LSSZs). Additionally, within strike-slip faults, transtensional, transpressional, and strike-slip segments can be distinguished along the fault strike, while three major categories and eight secondary categories of lateral zoning structural patterns are summarized along the fault dip. (2) Structural diagenesis within strike-slip fault zones includes deformation bands, cementation, dissolution and replacement, microfracturing, cataclasis, and smearing. (3) The differences in structural stress and strain govern the variations in structural diagenesis and, consequently, reservoir physical properties: (a) Both the HSSZ and LSSZ experienced more significant compaction and porosity reduction compared to cementation. However, the porosity reduction caused by structural diagenesis in the HSSZ was more intense than that in the LSSZ, whereas cementation in the HSSZ was greater than that in the LSSZ. (b) Under the influence of structural diagenesis, the physical properties of different segments decrease in the following sequence: transtensional segments, fault tips, weak transtensional segments, strike-slip segments, and transpressional segments.
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