玄马-南梁地区长4+5-长3成藏规律研究

Study on Forming Petroleum Deposit of Chang4+5-Chang3 in Xuanma-Nanliang Area

随着石油勘探的不断深入,玄马-南梁地区长4+5-长3不断有新的发现(T86、T88、T58、T49等井长4+5均获得高产工业油流),预测含油面积不断扩大。对该区延长组长4+5-长3油藏沉积相、砂体展布,油气成因分析、烃源岩发育对比、储层分布及评价等进行分析研究,掌握长4+5-长3石油成藏地质条件﹑成藏规律﹑控制因素及长4+5-长3油藏富集规律,研究认为长4+5-长3油层组为河流三角洲前缘沉积,油层组水下分流河道和河口坝沉积区为储层砂体的有利发育区和分布区,储层砂体的物性,总体上长3物性好于长4+5。认为原油形成于弱还原环境和淡水环境;成油母质为菌藻类和高等植物;原油均为成熟原油,起源于延长组烃源岩。

With the increasing deep exploration of petroleum exploration, Chang 4 ＋ 5 has the new discovery in Xuanma - Nanliang area, the T86, T88, T58, andT49 wells has got commercial oil flow of high production, the forecast area has been ex- tended. According to research of sedimentary facies, sand body distribution, oil and gas origin, comparison of the mature of source rocks, reservoir distribution and evaluation,we know that the geologic condition,regulation of forming petroleum depos- it,control factor,concentration of petroleum deposit of Chang4 ＋ 5 -Chang3 oil deposit. The results showed that the sedimen- tary facies of chang4 ＋ 5 - Chang3 formation is river delta frontal zone, under water distributary channel and mouth bar are the beneficial area and distribution area. The physical property of Chang3 is better than Chang4 ＋ 5. Crude oil was formed in the weak reduction and fresh water environment. Oil - generatied material is Homoneneae and higher plant. Crude oil is mature and from resource rocks of Yanchang formation.