歧口凹陷歧北斜坡沙一下亚段致密砂岩油形成条件  

Geological Conditions for Lower Es_1 Tight Sandstone Oil in Qibei Slope of Qikou Depression

作　　者：韩国猛[1] 周素彦[1] 唐鹿鹿[1] 蒲秀刚[1] 张宾 胡男 

机构地区：[1]中国石油大港油田公司勘探开发研究院 [2]中国石油集团渤海钻探工程有限公司

出　　处：《中国石油勘探》2014年第6期89-96,共8页China Petroleum Exploration

基　　金：中国石油天然气股份有限公司重大科技专项“大港油区大油气田勘探开发关键技术研究”(2014E-0601)

摘　　要：综合运用地震、岩心、薄片、地球化学分析资料,分析歧口凹陷歧北斜坡沙一下亚段致密油形成地质要素,明确了勘探潜力。研究认为,歧北斜坡沙一下亚段稳定平缓的构造背景、大面积分布的优质烃源岩、大面积分布的非均质致密砂岩储层、源储共生及近距离运移聚集有利于形成较大规模的致密油。歧北斜坡沙一下亚段发育多期远岸水下扇沉积,其中中扇亚相及断裂发育区储层物性相对较好,形成常规油藏;外扇亚相薄层致密砂岩发育,致密油大面积分布,形成典型的常规油与致密砂岩油纵向相互叠置、横向叠合连片的油藏分布序列。通过储层预测圈定致密油分布范围163km2,板2上薄层浊积席状砂甜点区是致密油钻探的首选区。Based on the seismic and core data, slices and geochemical analytic data, this paper analyzes the geological factors of lower Esl tight sandstone oil in Qibei slope of Qikou depression and clarifies the exploration potential in this area. The study indicates that the stable and gentle structural background of lower EsI in Qibei slope, high-quality source rock in a large area, distribution of heterogenerous tight sandstone reservoir in a large area, co-existence of source and reservoir and near-distance migration and accumulations are favorable for formation of tight oil on a large scale. Lower Es1 of Qibei slope developed muti-times offshore subaqueous fan, the middle fan subfacies and the physical properties of reservoirs in the fault development zone are relatively desirable, leading to development of conventional oil reservoirs. The outer fan subfacies with development of thin tight sandstone layers distributed with tight oil in a large area, shaping a series of oil reservoirs overlapped vertically and horizontally with conventional oil reservoirs and tight sandstone oil reservoirs in this area. Based on prediction of reservoir, tight oil is estimated to be distributed in a 163km2. The sweet-spot zone of the turbidite sand sheet in the upper section of Ban 2 thin layer is the first choice for tight oil exploration.

关 键 词：歧口凹陷 歧北斜坡 沙一下亚段 远岸水下扇 致密砂岩油 勘探潜力 

分 类 号：TE122.1[石油与天然气工程—油气勘探]