摘要
为了满足勘探后期油田生产的需要,利用区域地震资料、地层倾角变化和三维构造形态对杏北地区进行了精细的构造单元划分,在准确标定背斜轴部位置的基础上,将杏北地区划分为西北斜坡区、西南斜坡区、中央背斜带和东部缓坡带共4个构造单元。划分方案能够合理地解释目前研究区扶余油层的油气成藏特征,具有重要的石油地质意义,具体体现在以下4个方面:①西北斜坡区倾向于西北部成熟烃源岩区,运移方向与断裂走向近平行,不利于油气聚集;②西南斜坡区倾向于西南部排烃强度高值区,运移方向与断裂近垂直,反向断层下盘有利于油气富集;③中央背斜带构造脊为高速运移通道,其两侧近油源圈闭为主力油气聚集区;④东部缓坡带远离油源区且不存在运移路径,不能形成油气聚集。据此特征可以分区设计井位部署方案,从而降低勘探风险。
In order to meet the requirements of oilfield production in the late exploration period, fine tectonic units are divided in Xing-bei district, by means of regional seismic data, dip variation and three-dimensional structure. Based on the condition that the positionof anticlinal axis is accurately located, the Xingbei district has been divided into four tectonic units, including northwest slope area,southwest slope area, central anticline belt and east gentle slope belt. This classification can reasonably explain the hydrocarbon accu-mulation characteristics in Fuyu oil reservoir, so it is of great importance for petroleum geology in the following four aspects: ①north-west slope area tends to develop mature hydrocarbon source rocks in northwestern area, its hydrocarbon migration direction is parallelto the fault strike, so this area is unfavorable for oil and gas accumulation; ② southwest slope area tends to be in high hydrocarbon ex-pulsion intensity area in the southwestern area, its hydrocarbon migration direction is vertical to the fault strike, so footwall of reversefault in this area is favorable for oil and gas accumulating; ③ the structure ridge of central anticline belt is the high speed passway forhydrocarbon, so the traps adjacent to oil resource on both sides can be the main petroleum accumulation region; ④ east gentle slopebelt is far away from the oil resource, with no migration passway, so this area can't accumulate hydrocarbon. On the basis of those fea-tures, thewell placementcanbe designed differently in variousareasto reducetherisks of exploration.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2014年第3期20-23,112,共4页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目"油源断裂转换带优势输导油气条件研究"(41372153)
关键词
构造单元
精细划分
油气成藏
扶余油层
杏北地区
tectonic unit
fine division
hydrocarbon accumulation
Fuyu oil reservoir
Xingbei district
