塔中隆起奥陶系油气性质及运聚富集模式

doi:10.12108/yxyqc.20250105

Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (1): 53-67.doi: 10.12108/yxyqc.20250105

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Geological characteristics and enrichment model of Ordovician oil and gas in Tazhong Uplift

XIONG Chang^1,2,3, WANG Peng^1,2,3, LIU Xiaoyu⁴, WANG Wei⁴, ZHAO Xingxing^2,3,4, SUN Chong^1,2,3

1. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
2. R & D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, Xinjiang, China;
3. Xinjiang Engineering Research Center for Ultra-deep Complex Reservoir Exploration and Development, Korla 841000, Xinjiang, China;
4. Oil and Gas Field Productivity Construction Division, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China

Received:2024-03-21 Revised:2024-06-05 Online:2025-01-01 Published:2025-01-04

Abstract

Abstract: Based on the data of structural analysis，fault distribution，production dynamics，and geochemistry，an analysis is conducted on the characteristics of oil and gas properties as well as productivity distribution in the Tazhong area during the Ordovician period. The factors contributing to oil and gas accumulation are examined from three perspectives：oil and gas charging，transport system，structure，and the relationship between migration and accumulation. Consequently，an accumulation model is established. The results show that：（1）The crude oil found in the Tazhong area during the Ordovician period is predominantly light crude oil with low density，viscosity， and sulfur content. Its density ranges from 0.75 to 0.85 g/m³，while the gas-oil ratio varies between 119 and 82， 367 m³/m³. This region contains multi-phase oil and gas reservoirs where there is no distinct boundary between the oil and gas phases. The dryness coefficient of natural gas ranges from 0.70 to 0.98，and the carbon isotope composition of methane in natural gas shows a wide variation ranging from -35.7‰ to -61.4‰. Different regions exhibit amantane index（MDI）values ranging from 0.33 to 0.64. The eight major oil and gas charging points exhibit characteristics such as low crude oil density，high gas-oil ratio，and elevated levels of methane carbon isotope and MDI. Moving along the strike-slip fault zone towards the south or away from it results in an increase in density，while the gas-oil ratio，methane carbon isotope，and MDI all decrease. Variations in gas penetration intensity across different blocks may lead to localized differences in these patterns.（2）The distribution pattern of oil and gas in the study area is primarily influenced by localized oil and gas charging. Oil and gas wells surrounding the 8 charging points typically exhibit high production rates，due to reservoir development scale， there may be occasional occurrences of low-producing wells near the charging points. The regional distribution of filling points' production capacity can be categorized into three types：“northern dominance in natural gas，southern abundance in crude oil，”“central prevalence of natural gas with flanking areas rich in crude oil，”and“generally abundant natural gas with localized presence of crude oil”. However，low-producing wells and those located far from the charging points are dispersed over a wide range.（3）The oil and gas enrichment mode in the study area during the Ordovician period is characterized by tension-torsional large faults controlling vertical hydrocarbon charging，unconformity and strike-slip faults governing lateral hydrocarbon migration，interlayer karst within fracture zones providing reservoir space for hydrocarbon accumulation，and local structural highs and platform areas serving as favorable directions for hydrocarbon accumulation.

Key words: light crude oil, amantane index, tension-torsional large faults, strike-slip fault, unconformity, fracture zones, karstification, Ordovician, Tazhong Uplift, Tarim basin

CLC Number:

TE122.1

XIONG Chang, WANG Peng, LIU Xiaoyu, WANG Wei, ZHAO Xingxing, SUN Chong. Geological characteristics and enrichment model of Ordovician oil and gas in Tazhong Uplift[J].Lithologic Reservoirs, 2025, 37(1): 53-67.

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