哈拉哈塘油田北部奥陶系碳酸盐岩缝洞型油藏缝洞单元特征分析

【作者】 李洁；

【导师】 戴鸿鸣； 罗慎超；

【作者基本信息】 西南石油大学 ， 工程硕士（专业学位）， 2020， 硕士

【摘要】 本文以塔里木盆地哈拉哈塘北部地区奥陶系缝洞型油藏为研究对象,采用地面与地下、室内与室外、动态与静态研究相结合的研究方法,在流体特征和储层特征分析的基础上,以钻录井、测井和地震资料为依据,识别和划分奥陶系缝洞型油藏缝洞系统;以原油全油气相色谱指纹和生产动态资料为依据,划分缝洞系统中缝洞单元,剖析典型缝洞单元特征,并以哈901-2缝洞单元为代表,建立缝洞单元地质模型,优化开发注水方案。研究表明:①哈拉哈塘油田北部奥陶系原油密度具有由北向南降低的趋势,原油具有相同油源,哈6区块的原油存在生物降解,奥陶系天然气以成熟的油田伴生气为主,表现为成熟-高成熟的湿气特征。②哈拉哈塘油田北部奥陶系碳酸盐岩储层可划分为洞穴型、孔洞型、裂缝～孔洞型和裂缝型四大类储层,储层中缝洞系统的发育和分布受潜山岩溶、层间岩溶和断裂控制。③依据钻录井、测井和地震资料,哈拉哈塘油田北部奥陶系缝洞型储层划分出20个缝洞系统。以原油色谱指纹和油井生产动态特征为基础,除单井所控制的缝洞单元外,还划分出18个多井缝洞单元。④通过地质模型的建立,预测哈901-2井累计产油量为12×104t,缝洞单元内累计产油量为42.5×104t,采出程度为10%时,哈901-2井应转注水开发,最优日注入量应在10 m3/d～15 m3/d之间调整,注水见效高峰期过后,建议采取轮换注水和周期注水相结合方式。更多还原

【Abstract】 By using research methods of combining ground and underground,indoor and outdoor,dynamic and static research,based on the analysis of fluid characteristics and reservoir characteristics and drilling,logging and seismic data,the fracture-cave system of Ordovician fracture-cave reservoir has been identified and divided;Based on the crude oil gas chromatographic fingerprints and production dynamic data,the fracture-cave units in the fracture-cave system are divided,and the characteristics of typical fracture-cave units are analyzed.Taking the fracture-cave unit of Ha 901-2 well as the representative,the geological model of the fracture-cave unit has been established and the water injection scheme has been optimized.The research shows that:①The density of Ordovician crude oil in the northern part of the Halahatang oil field decreases from north to south.The crude oil has the same oil source,and there is biodegradation of crude oil in the Ha 6 block.The Ordovician natural gas is dominated by mature oilfield associated gas,which is characterized by mature to highly mature moisture.②The Ordovician carbonate reservoirs in the north of Halahatang Oilfield can be divided into four types:cave type,pore type,fracture-cave type and fracture type.The development and distribution of the fracture-cave system in the reservoir are affected by buried hills Karst,interlayer karst and fracture control.③According to drilling,logging and seismic data,20 fracture-cave systems have been divided from Ordovician fracture-cave reservoirs in the northern Halahatang Oilfield.Based on crude oil chromatographic fingerprints and oil well production dynamic characteristics,in addition to the fracture-cave units controlled by a single well,18 multi-well fracture-cave units are also divided.④Through the establishment of the geological model,it is predicted that when the cumulative oil production of Well Ha 901-2 is 12 × 104 t,the cumulative oil production in the fracture-cave unit is 42.5 × 104 t,and when the production degree is 10%,the development method of well 901-2 should be transferred.For water injection development,the optimal daily injection volume should be adjusted between 10m3/d～15m3/d.After the peak period of water injection effectiveness,it is recommended to adopt a combination of alternating water injection and periodic water injection.更多还原