Microscopic Characteristics of Fine-Grained Reservoirs in Lucaogou Formation, Santanghu Basin

doi:10.7657/XJPG20230305

Abstract

Abstract:

The fine-grained rocks in volcanic-active strata are characterized by complex composition, tight cementation, and strong heterogeneity. The concept and classification methods of fine-grained rocks were systematically reviewed. Combined with rock thin section identification, whole-rock X-ray diffraction (XRD) experiment, and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) experiment, a method for studying the microscopic characteristics of fine-grained reservoirs was established. By using this method, the petrological characteristics, and types and genesis of reservoir spaces of the fine-grained rocks in the Lucaogou formation of the Santanghu basin were analyzed. The results show that the fine-grained reservoirs in the Lucaogou formation are mainly composed of fine-grained carbonate rocks and fine-grained volcanoclastic rocks. The reservoir space is mainly contributed by fractures and pores, and the fractures are dominantly structural fractures and interbed. Fine-grained volcanoclastic rocks generally have volcanic dust solution pores, rock debris solution pores, crystal debris solution pores, and calcite vein solution pores. Micro-nanopores are relatively developed in fine-grained carbonate rocks, including dolomite intercrystalline pores, calcite intercrystalline pores, and clay mineral intercrystalline pores. The enrichment of volcanic material provides material basis for high-quality fine-grained reservoirs in volcanic-active strata, and the alternation of various laminae in fine-grained reservoirs is conducive to the formation of micropores and microfractures.

Key words: Santanghu basin, Lucaogou formation, fine-grained rock, reservoir, microscopic characteristic, reservoir space

CLC Number:

TE122

QIN Enpeng, ZHANG Junying, ZHANG Shengbing, LIU Juntian, ZHANG Xiaoqin, CHEN Yonghui. Microscopic Characteristics of Fine-Grained Reservoirs in Lucaogou Formation, Santanghu Basin[J]. Xinjiang Petroleum Geology, 2023, 44(3): 299-306.

Figures/Tables 6

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