东濮凹陷杜寨地区深层砂岩储层致密化与油气充注关系  

Coupling relationship between deep sandstone reservoir densification and hydrocarbon injection of Duzhai area,Dongpu depression

作　　者：张园园[1] 蒋有录[1] 刘景东[1] 徐田武[2] 吕雪莹 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石化中原油田分公司勘探开发研究院,河南濮阳457001

出　　处：《东北石油大学学报》2016年第3期70-79,共10页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05006-004)

摘　　要：为分析东濮凹陷杜寨地区沙三中—下亚段致密砂岩储层演化与油气充注过程的耦合关系,综合运用铸体薄片、阴极发光、扫描电镜、荧光显微及流体包裹体等测试方法,明确杜寨地区沙三中—下亚段储层特征、成岩作用、成岩演化序列、储层孔隙度演化史和油气充注史等。结果表明:杜寨地区沙三中—下亚段处于中成岩B期至晚成岩阶段,在经历三期钙质胶结、三期溶蚀、持续压实的复杂成岩过程后,在斜坡带发育低孔低渗砂岩储层,在洼陷带发育特低孔特低渗致密砂岩储层。东营组沉积末期,储层尚未致密化,低熟—成熟有机质在斜坡带聚集形成常规型油气藏,在洼陷带附近形成"边致密边成藏"型致密砂岩油气藏。明化镇组沉积末期至今,储层致密,除少量油气向上运移、在斜坡带形成"边致密边成藏"型油气藏外,仍有大量晚期生成的天然气在洼陷带附近聚集,形成典型的"先致密后成藏"型致密砂岩气藏。Using casting thin sections cathodoluminescence and scanning electron microscope fluorescence microscopy and fluid inclusion analysis testing method,we analyzied the coupling relationship between deep sandstone reservoir densification and hydrocarbon injection of Duzhai area,Dongpu depression,and made a comprehensive analysis of the reservoir characteristics,diagenesis and diagenetic evolution sequence.History of hydrocarbon injection shows that the middle and lower sub-member of Es3 in Duzhai area belong to the ' B' late period stage of diagenesis.After a complex diagenetic process for three calcareous cementation,three dissolution and continues compaction,the slope zone developes low porosity and low permeability sandstone reservoirs,and the depression belt developes the ultra low porosity and ultra low permeability tight sandstone reservoirs.At the end of Ed,reservoir had not been densified,while oil and gas were accumulated into the surrounding structural high parts,forming conventional reservoirs in the slope zone and the ' densifying while reservoiring' type tight sandstone reservoirs.Since the end of Ng,the reservoirs are compacted gradually.In addition to a small amount of oil and gas upward adjustment in the slope zone formed 'densifying while reservoiring' type reservoir,there are still a large number of natural gas forming typical 'reservoiring after densifying' type of tight sandstone gas reservoirs,reservoiring in the vicinity of depression belt.

关 键 词：深层致密砂岩 孔隙度演化 油气充注期 成岩—成藏匹配关系 杜寨地区 东濮凹陷 

分 类 号：TE122[石油与天然气工程—油气勘探]