摘要
牛心坨地区沙四段勘探程度较低,但勘探前景较好。前人研究普遍认为牛心坨地区沙四段砂岩油藏主要为常规的构造、岩性油藏,并建立了沙四段油藏源控成藏模式,指出构造高点及断裂附近为油气富集的有利部位。但近期作者团队研究发现研究区沙四段砂岩储层存在普遍致密的现象,研究其致密油形成主控因素及有利区预测对研究区未来勘探具有指导意义。本文利用30口井的资料,4103个分析测试数据(包括264个烃源岩地化数据,2624个储层物性数据,55个压力数据),采用功能要素组合的方法,剖析了研究区沙四段致密油形成条件,阐明了致密油形成的主控因素,并预测了有利区带的分布范围。研究结果表明:牛心坨地区沙四段砂岩具有低孔富集、低压稳定、源储紧邻,连片富集的特征,具备致密油形成的条件。致密油的形成与富集受储层和烃源岩的联合控制作用。此外,牛心坨地区沙四段储层孔隙度中等时(5%<Φ<12%),含油气性最好,牛心坨亚段源岩潜力最大,已发现的油气距排烃中心距离小于10 km;依据T-DPS分布发育模式(D:沉积相;P:构造稳定带;S:烃源岩)预测了致密油有利区带分布范围,I类有利区(孔隙度为6%-10%)位于坨43—坨16井区、坨605—坨24井区以北、坨45—坨25井区、研究区中部。II类有利区位于坨1井区、坨602井区、坨21—坨15井区南沙四段储层有利区。研究成果对研究区勘探开发指明了方向。
The degree of exploration of the fourth member of the Shahejie Formation in the Niuxintuo area is low,but the exploration prospects are good.Previous studies generally believe that the sandstone reservoirs in the fourth member of the Shahejie Formation are mainly conventional structural and lithological reservoirs,and the source controlled reservoir forming model of the fourth member of Shahejie formation is established,and it is pointed out that the structural high point and the vicinity of faults are favorable places for oil and gas enrichment.However,a recent study by the author’s team found that the sandstone reservoirs of the fourth member of the Shahejie Formation in the study area are generally tight.It is significant to study the main controlling factors of tight oil formation and the prediction of favorable areas for future exploration in the study area.Based on the analysis of 30 wells and 4103 test data(including 264 geochemical data of hydrocarbon source rocks,2624 physical property data of reservoirs and 55 pressure data),the formation conditions of tight oil in the fourth member of the Shahejie Formation in the study area are analyzed by using the method of functional element combination,the main controlling factors of tight oil formation are clarified,and the distribution range of favorable zones is predicted.The results show that the sandstone of the fourth member of Shahejie Formation in the Niuxintuo area has the characteristics of low porosity enrichment,low pressure stability,close source to reservoir distance and contiguous enrichment,and has the conditions for the formation of tight oil.The formation and enrichment of tight oil are controlled by the reservoir and source rock.In addition,the fourth member of the Shahejie Formation in the Niuxintuo area has medium porosity(5%<Φ<12%),with the best oil and gas potential and the source rock potential of the Niuxintuo sub member is the largest.It is found that the distance between oil and gas reservoirs and the hydrocarbon expulsion center is l
作者
庞宏
吴松
胡英杰
王海朋
丁旭光
刘兴周
惠沙沙
陈昌
郭军敏
PANG Hong;WU Song;HU Yingjie;WANG Haipeng;DING Xuguang;LIU Xingzhou;XI Shasha;CHEN Chang;GUO Junmin(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum-Beijing,Beijing 102249,China;Basin and Reservoir Research Center,faculty of Earth Sciences,China University of Petroleum-Beijing,Beijing 102249,China;Exploration and Development Research Institute of PetroChina Liaohe Oilfield Company,Panjin 124000,China;Production logging project department of Liaohe Branch,District Xinglongtai,Panjin 124000,China)
出处
《石油科学通报》
2020年第4期467-482,共16页
Petroleum Science Bulletin
基金
国家自然科学基金项目(U19B6003)
中国石油大学(北京)科研基金(2462020YXZZ022)资助。
关键词
牛心坨
沙四段
致密油
主控因素
有利区带预测
Niuxintuo area
the fourth member of Shahejie Formation
tight oil
main control factors
favorable zone prediction
