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松南中央坳陷泉四段上生下储式致密砂岩油成藏主控因素
蔡来星,卢双舫,张训华,黄文彪,肖国林,吴志强
0
(中国石油大学非常规油气与新能源研究院,山东青岛 266580;青岛海洋科学与技术国家实验室, 山东青岛 266071;中国地质调查局青岛海洋地质研究所,山东青岛 266071)
摘要:
基于“优质源岩控藏”理论和“储层甜点找油”思想,应用测、录井、试油、薄片等资料,系统总结松南中央坳陷区泉四段致密油的分布规律,剖析不同类型致密砂岩油成藏的主控因素。研究表明:致密砂岩油藏集中分布在长岭凹陷内及其周边斜坡区,具有“满坳含油、宏观连片”的特征和“东富西贫、南富北贫”的差异性;青一段下段烃源岩残余有机碳含量(TOC)大于2.0%的优质源岩展布范围控制致密油藏分布格局;异常高压与源储断层的空间配置关系控制下部砂组含油性,剖面上油气下排深度最大为140 m;平面上超压大于10 MPa、与断层距离小于2500 m的区域是Ⅱ~Ⅳ砂组的致密油藏富集区;优质储层物性“甜点”控制致密油富集程度及产量;坳陷型湖盆上生下储式致密砂岩油藏的形成主要存在凹陷区“源内直排倒灌”和斜坡区“源边反转断层遮挡”两种成藏模式。
关键词:  主控因素  致密砂岩油藏  上生下储  泉四段  松南中央坳陷区
DOI:10.3969/j.issn.1673-5005.2016.06.002
投稿时间:2016-06-25
基金项目:国家“973”专项课题(2014CB239005);国家重点自然科学基金项目(41330313);国家自然科学基金项目(41402109);国家油气重大专项(2011ZX05007-001)
Main controlling factors of above-generation and below-storage tight sandstone oil reservoirs at Quantou 4 Formation of central depression in southern Songliao Basin
CAI Laixing,LU Shuangfang,ZHANG Xunhua,HUANG Wenbiao,XIAO Guolin,WU Zhiqiang
(Research Institute of Unconventional Petroleum and Renewable Energy in China University of Petroleum, Qingdao 266580,China;Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;Qingdao Institute of Marine Geology,China Geological Survey, Qingdao 266071, China)
Abstract:
This paper systematically studied different types of tight sandstone oil reservoirs in Quantou 4 Formation,based on the theory of "high-quality source rocks control hydrocarbon accumulation" and the idea of "explore tight oil through sweet spots". Extensive field data such as logging,oil tests and sandstone thin sections were used. The results show that the tight sandstone oil reservoir is widely distributed in Changling depression and its surrounding slope area,which is characterized as full oil whole depression but with rich deposition imbalancedly distributed more in the eastern and southern regions. The distribution range of high-quality source rocks whose TOC>2.0% at bottom of Qingshankou 1 Formation controls the pattern of the tight sandstone oil reservoir. The relation between abnormally high pressure and source faults controls the formation of oil resovior in the lower part of Quantou 4 Formation. The maximum depth of down-migration is estimated 140 m. The area whose overpressure higher than 10 MPa and distance faults shorter than 2500 m is an enrichment area of tight sandstone oil reservoir in Ⅱ~Ⅳ sand group of Quantou 4 Formation. These sweet spots of high-quality reservoir control the degrees of enrichment and production of tight sandstone oil reservoir. Our research indicates that "directly drained migration" within source rocks area and "reverse fault screened" in the side slope are two main models for above-generation and below-storage tight sandstone oil reservoirs to formed in depressed lake basins.
Key words:  main controlling factors  tight sandstone oil reservoirs  above-generation and below-storage  Quantou 4 Formation  central depression in southern Songliao Basin
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