鄂尔多斯盆地姬塬地区延长组长6油藏成藏条件和充注模式  

Reservoir Forming Conditions and Filling Models for Chang 6 Oil Reservoir of the Yanchang Formation in Jiyuan Area, Ordos Basin

作　　者：刘广林 王亚玲[2,3] 马爽[4] 韩天佑[2,3] 陈璐 楚美娟[2,3] 时志强 LIU GuangLin;WANG YaLing;MA Shuang;HAN TianYou;CHEN Lu;CHU MeiJuan;SHI ZhiQiang(Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;Research Institute of Exploration and Development of Changqing Oilfield Company,PetroChina,Xi’an 710018,China;National Engineering Laboratory for Exploration and Development of Low⁃Permeability Oil&Gas Fields,Xi’an 710018,China;Geological Institute of The First Oil Production Plant of Changqing Oilfield Company,PetroChina,Xi’an 710018,China;Logging Application Research Institute of CNPC Logging Co.,Ltd,Xi’an 710018,China)

机构地区：[1]成都理工大学沉积地质研究院,成都610059 [2]中国石油长庆油田公司勘探开发研究院,西安710018 [3]低渗透油气田勘探开发国家工程实验室,西安710018 [4]中国石油长庆油田公司第一采油厂地质所,西安710018 [5]中国石油集团测井有限公司测井应用研究院,西安710018

出　　处：《沉积学报》2019年第6期1152-1161,共10页Acta Sedimentologica Sinica

基　　金：国家科技重大专项（2016ZX05050,2017ZX05001002-008）;中国石油天然气股份有限公司科技重大专项（2016E-0501)~~

摘　　要：姬塬地区长6油层在区域上含油性差异大,西部和东部发育大规模岩性油藏,中部出水井较多。通过对三个地区的烃源岩、储层特征、输导体系、遮挡条件、成藏动力、成藏期次和充注程度研究,明确了成藏条件和成藏机理的差异性。西部烃源岩生烃强度大,裂缝网络发育,过剩压力大,充注程度高,成藏条件优越;东部烃源岩厚度薄,但裂缝发育,储层物性好,源储压差大,石油侧向运移,充注程度较高,成藏条件较好;中部烃源岩厚度薄,裂缝不发育,遮挡条件差,过剩压力低,充注程度低,成藏条件差。成藏条件和成藏机理的差异导致充注模式不同,西部为饱和充注型,东部为欠饱和充注型,中部为欠充注型。研究成果为姬塬地区长6油层石油勘探开发提供指导依据。Chang 6 reservoirs of different regions in the Jiyuan area have large differences in oil bearing characteris tics.Large lithologic reservoirs are developed in the west and east,but there are many wells producing water in the middle region.By studying source rocks,reservoir characteristics,transmission systems,shielding conditions,reser voir forming dynamics,accumulation period,and filling degree of the three regions,the differences between reser voir forming conditions and accumulation mechanisms are clarified.In the western region,the reservoir forming con ditions,characterized by high hydrocarbon generation intensity,developed fracture networks,high excess pressure,and high filling degree,are the best.In the east,the reservoir forming conditions,characterized by thin hydrocarbon source rocks,but well developed fractures,good reservoir properties,large pressure difference between source and reservoir,lateral migration of oil,and high degree of filling,are better.In the central region,the reservoir forming conditions,characterized by thin source rocks,undeveloped fractures,poor shielding conditions,low excess pres sure,and low filling degree,are poor.The differences in reservoir forming conditions and accumulation mechanism lead to different types of filling.The western region belongs to the saturated filling type,the eastern part belongs to the under saturated filling type,and the central region belongs to the under filled type.The research results provide guidance for petroleum exploration and development for Chang 6 reservoirs in Jiyuan.

关 键 词：长6油层 姬塬地区 成藏条件 成藏机理 充注类型 

分 类 号：P618.13[天文地球—矿床学]