Characteristics and Genesis of Calcareous Interlayers in Underwater Distributary Channel Sandbodies in Chang 8 Reservoir，Ganquan Oilfield

doi:10.7657/XJPG20230205

Abstract

Abstract:

The study on calcareous interlayers is of great significance to well pattern deployment in the early stage of oilfield development and to the increase of reserves and production in the late stage. By means of core observation，well logging data analysis，casting thin section and SEM observation，the lithology，electrical properties，distribution，and genesis of calcareous interlayers in the eighth member of Yanchang formation (Chang 8 member) in the Ganquan oilfield and the influence of such calcareous interlayers on reservoir heterogeneity were systematically studied. The results show that the calcareous interlayers were developed under the control of underwater distributary channel microfacies，mainly at the top and bottom of sand bodies. The calcareous interlayers exhibit the geological characteristics of high stability and large thickness，and the logging response characteristics of low gamma，low acoustic slowness and high resistivity. The development of the calcareous interlayers was mainly controlled by calcite cementation of two periods. The calcite cementation of the first period was related to the supersaturated precipitation of calcite in the syndiagenetic stage，during which the dissolution of crustal biological residues，Ca²⁺ and $CO_{3}^{2-}$ carried by rivers，and the dissolution of CO₂ from the atmosphere provided materials for calcite cementation. The calcite cementation of the second period was the porous cementation in the Phase B of the middle diagenetic stage，and the residual Ca²⁺ and $CO_{3}^{2-}$ in the original formation fluids，the dissolution of unstable components，and Ca²⁺ and $CO_{3}^{2-}$ precipitated from mineral transformation provided materials for calcareous cementation. The development of calcareous interlayers enhanced the intralayer heterogeneity of sandbodies，leading to poor vertical sandbody connectivity and complex oil-water relationships. During the water flooding of the reservoir，calcareous interlayers obliquely intersect with the adjacent non-permeable interlayers，forming effective barriers and remaining-oil enriching areas locally.

Key words: Ganquan oilfield, Yanchang formation, Chang 8 reservoir, calcareous interlayer, tight sandstone, underwater distributary channel, diagenesis, calcite cementation

CLC Number:

TE112

CUI Yaoke, DU Guichao, WANG Fengqin, WANG Cong’e, CHEN Yiyang, WANG Ying, HUANG Xingyu. Characteristics and Genesis of Calcareous Interlayers in Underwater Distributary Channel Sandbodies in Chang 8 Reservoir，Ganquan Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(2): 161-168.

Figures/Tables 7

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