滨里海盆地东缘石炭系盐下碳酸盐岩油气藏成藏规律与勘探技术

doi:10.12108/yxyqc.20230607

Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 54-62.doi: 10.12108/yxyqc.20230607

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Hydrocarbon accumulation rules and exploration technologies of Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin

WANG Xueke, WANG Zhen, JI Zhifeng, YIN Wei, JIANG Ren, HOU Yu, ZHANG Yiqiong

PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2023-05-25 Revised:2023-06-20 Online:2023-11-01 Published:2023-11-07

Abstract

Abstract: Based on seismic,drilling and thin section data,seismic wave impedance reservoir inversion technology was used to study the characteristics and hydrocarbon accumulation rules of Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin,and the next risk exploration direction was pointed out.The results show that:（1）Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin can be divided into limestones,dolomites,dolomitic limestones,calcareous dolomites,silicified siliceous rocks. The reservoir porosity is 4%-12%,and the permeability is generally less than 1 mD,belonging to lowmedium porosity and low permeability vug-pore reservoirs.（2）Lithologic reservoirs are mainly developed in Aknol structural belt in the study area,without uniform oil-water contact. The oil layers are distributed in thin layers,with poor correlation and continuity. High-quality reservoirs are mostly high growth rate beach bodies in the upper part of high-frequency third-order sequence cycles and karst reservoirs near unconformity surfaces.（3）The seismic wave impedance reservoir inversion technology based on the initial model constrained by horizon and logging was used to predict thin carbonate reservoirs,which can more clearly show the horizontal and vertical distribution characteristics of KT-Ⅰ and KT-Ⅱ reservoir groups. The favorable reservoirs in the study area are mainly developed in G1 and G4 sublayers at the top of KT-Ⅱ reservoir group.

Key words: wave impedance reservoir inversion, vug-pore reservoir, beach body, karst reservoir, accumulation rule, lithologic reservoir, subsalt carbonate, Carboniferous, Pre-Caspian Basin

CLC Number:

TE122.1

WANG Xueke, WANG Zhen, JI Zhifeng, YIN Wei, JIANG Ren, HOU Yu, ZHANG Yiqiong. Hydrocarbon accumulation rules and exploration technologies of Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin[J].Lithologic Reservoirs, 2023, 35(6): 54-62.

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Hydrocarbon accumulation rules and exploration technologies of Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin

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