摘要
为了研究含油气盆地斜坡区受断裂控制油气分布规律,在断裂、盖层和砂体空间匹配同层侧向输导油气机理及其条件研究的基础上,通过断盖空间匹配断接厚度和其封油气所需的最小断接厚度相对大小比较,确定断盖空间匹配封闭区;通过砂体所在地层砂地比和砂体连通所需的最小地层砂地比值相对大小比较,确定连通砂体分布区,将二者叠合建立了一套斜坡区油气输导有利区识别的预测方法,并将其应用于海拉尔盆地贝西斜坡呼和诺仁地区南二段“断盖砂”空间匹配同层西侧向输导条件下油气有利区的预测中。研究表明:贝西斜坡呼和诺仁地区南二段断盖空间匹配封闭区主要分布在其北部和西南部局部地区,南二段连通砂体主要分布在其中东部和中西部地区,断盖砂空间匹配较好位置主要分布在中西部、中东部和北部局部地区,有利于贝尔凹陷南一段源岩生成的油气在南二段侧向运移和聚集。目前贝尔凹陷贝西斜坡呼和诺仁地区南二段已发现油气主要分布在其中西部、中东部和北部局部地区与研究结果相吻合,表明该方法用于预测斜坡区同层侧向输导油气有利区是可行的。
In order to study the distribution rule of the oil and gas controlled by the faults in the slope area of the petroliferous basin,based on the research on the oil-gas mechanism and conditions of the same-layer lateral transportation in fault-caprock-sandstone spatial matching,the fault-caprock spatial-matching sealed area was determined through the relative value comparison between the faulted thickness of fault-caprock spatial matching and the minimal faulted thickness for sealing oil and gas.Through the relative value comparison between the sandstone-formation ratio for the sandbody and the minimum sandstone-formation ratio required by the sandstone connection,the connected sandbody distribution area was determined.By integrating the above two methods and results,a set of predicting methods about the identification of the oil-gas transporting favorable area in the slope area was established,and was applied to predict the oil-gas favorable block in Kn of Huhenuoren area in Beixi Slope of Hailer Basin under the condition of the same-layer lateral transporting in“fault-caprock-sandstone”spatial matching.The studies show that the fault-caprock spatial-matching sealed area of Kn of Huhenuoren area in Beixi Slope is mainly distributed in the northern and southwest parts and the connected sandbody in Kn is mainly distributed in the eastern and central-western parts.The better places of the fault-caprock-sandstone spatial matching are mainly distributed in the middle-west,middle-east and parts of the north,which are favorable for the lateral migration and accumulation in Kn of the oil-gas generated by Kn source rock.At present,the results of the study is consistent with the discovered oil and gas in Kn of Huhenuoren area in Beixi Slope,which are mainly distributed in the middle-west,middle-east and parts of the north,indicating the method is feasible to predict the favorable area of the same-layer lateral-transported oil and gas in the slope area.
作者
孙加华
SUN Jiahua(PetroChina Daqing Tamutsag Co Ltd, Daqing 163618, China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2021年第3期51-57,共7页
Petroleum Geology & Oilfield Development in Daqing
基金
国家自然科学基金项目“砂泥岩层系中油源断裂输导油气优势路径演化及识别研究”(41872157)。
关键词
斜坡区
断盖砂
空间匹配
同层侧向输导
有利区
预测方法
slope area
fault-caprock-sandstone
spatial matching
the same-layer lateral transportation
favorable area
predicting method
