HQ1区块齐古组稠油油藏倾斜油水界面主控因素

doi:10.7657/XJPG20250508

摘要/Abstract

摘要：

为确定克拉玛依油田HQ1区块齐古组浅层稠油油藏油水关系及其主控因素，以油藏边部油水关系矛盾突出的h-4井区为例，利用密集井网资料及测试分析资料，探讨了砂体展布、水动力、储集层物性、油藏充注压力和构造作用对油藏油水界面的影响。研究区h-4井区油水界面特征明显，东部含水边界线与构造线平行，西部含水边界线与构造线斜交且油水界面倾斜。形成倾斜油水界面的主要原因为构造作用影响下的断裂阶段性开启、原油黏度变化导致的油水界面调整滞后，油藏具构造活动与非稳态耦合的成藏机制。研究区西部断裂开启形成原油的运移通道，原油在齐古组聚集成藏。西部断裂封闭后再次开启，油藏被破坏，原油溢散形成西高东低油水界面；同时，原油遭受降解，形成原油黏度西高东低的特征。在构造作用以及原油黏度影响下，油水界面的水平调整明显滞后，油藏属于非稳态油气藏。

关键词: 克拉玛依油田, HQ1区块, 齐古组, 稠油油藏, 油水界面, 原油黏度, 非稳态油藏

Abstract:

In order to determine the oil-water relationship and its controlling factors in the shallow heavy oil reservoirs of the Qigu formation in Block HQ1, Karamay oilfield, the study focuses on the h-4 well area, which exhibits significant oil-water distribution complexities at the reservoir margins. Using the data of dense well pattern and test analysis, the influences of sand body distribution, hydrodynamic conditions, reservoir properties, hydrocarbon charging pressure, and tectonic activities on the oil-water contact (OWC) are identified. The h-4 well area demonstrates distinctive OWC characteristics, where the water boundary is parallel with the structural line in the east, and the water boundary obliquely intersects the structural line in the west, resulting in a tilted OWC. This tilted OWC is believed to have been resulted from the periodical fracture opening due to tectonic activities and the OWC adjustment hysteresis is caused by oil viscosity variation, indicating a coupled mechanism of tectonism and unsteady reservoir formation. The fracture opening in the western part of the study area provided oil migration pathways, facilitating oil accumulation in the Qigu formation. Subsequent fracture sealing and reactivation events led to reservoir compartmentalization, creating a OWC that is high in west and low in east. Oil biodegradation shaped a similar viscosity feature. The combined effects of tectonic activities and viscosity variations significantly retard horizontal adjustments of OWC, characterizing the reservoir as a unsteady hydrocarbon accumulation system.

Key words: Karamay oilfield, Block HQ1, Qigu formation, heavy oil reservoir, oil-water contact, oil viscosity, unsteady reservoir

中图分类号:

TE122.3

颜永何, 李海波, 朱爱国, 张无忌, 张晶, 刘刚, 陈燕辉, 汪彪. HQ1区块齐古组稠油油藏倾斜油水界面主控因素[J]. 新疆石油地质, 2025, 46(5): 582-590.

YAN Yonghe, LI Haibo, ZHU Aiguo, ZHANG Wuji, ZHANG Jing, LIU Gang, CHEN Yanhui, WANG Biao. Main Controlling Factors of Tilted Oil-Water Contact of Shallow Heavy Oil Reservoirs of Qigu Formation in Block HQ1，Karamay Oilfield[J]. Xinjiang Petroleum Geology, 2025, 46(5): 582-590.

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井名	油水界面/m		井名	油水界面/m		井名	油水界面/m
井名	深度	海拔	井名	深度	海拔	井名	深度	海拔
h45095井	340.4	-57.4	h9001井	371.3	-89.0	h45270井	391.1	-109.0
h45140井	354.4	-70.9	h9003井	382.6	-100.8	h45264井	388.5	-106.9
h45177井	359.1	-76.1	J402井	397.9	-117.9	h45415井	410.0	-128.8
h45179井	351.4	-67.5	h45155井	373.0	-91.2	h45161井	377.1	-95.5
h45227井	365.4	-82.7	h45166井	375.0	-92.9	h45250井	409.6	-128.6