Toson-Uul油田查干组油层油水分布主控因素分析

Main controlling factor analysis of oil and water distribution of Chagan Formation oil layer in Toson-Uul Oilfield

Toson-Uul油田属于复杂断陷盆地,查干组油层为一套近岸水下扇沉积背景下的含凝灰质储层,油藏具有断块构造破碎、储层发育不稳定、岩性复杂、物性差等特点。文中应用油藏描述方法,分析了该油田的油水分布主控因素。研究认为,断层、不整合面及砂体为油气运移提供了良好通道,构造、断层对成藏和油气分布起决定性作用,沉积相对油气平面和纵向分布范围和油层发育程度起到一定控制作用,储层物性直接控制油气储量及产能。通过油水分布主控因素研究,为该油田各类地质方案编制提供了可靠依据,对认识同类油田油水分布规律具有指导意义。

Toson-Uul Oilfield belongs to complicated faulted basin.Chagan Formation oil layer is tuffaceous reservoir under the depositional settings of nearshore subaqueous fan.Reservoirs have some characteristics of fractured structure,instability reservoir,complicated lithology,poor physical property and many types of reservoirs.This paper analyzes the main controlling factors of oil and water distribution using reservoir descriptions and based on the research of oil and water distribution law.The study suggests that the fault,the plane of unconformity and sand body can supply a good passage for oil and gas migration,and the structure and fault play a critical role in oil accumulation and hydrocarbon distribution.Sedimentary facies can control the plane and vertical distribution of oil and gas and the development degree of oil layer.Reservoir physical property dominates the oil and gas reserves and productivity directly.The research on the main controlling factors of oil and water distribution can provide the reliable basis for geology project drawing up and can provide guiding for knowing the distribution law of oil and water in similar oilfield.