鄂尔多斯盆地长7_(3)亚段页岩油可动烃资源量评价方法  

Research on evaluation method of movable hydrocarbon resources of shale oil in the Chang 7_(3) sub-member in the Ordos Basin

作　　者：李士祥[1,2] 周新平[1,2] 郭芪恒 刘建平 刘江艳 李树同[4,5] 王博 吕奇奇[6] LI Shixiang;ZHOU Xinping;GUO Qiheng;LIU Jianping;LIU Jiangyan;LI Shutong;WANG Bo;LÜ Qiqi(National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi’an 710018,China;Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi'an 710018,China;Branch Exploration Department of PetroChina Changqing Oilfield Company,Xi'an 710018,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Key Laboratory of Petroleum Resources,Gansu Province,Lanzhou 730000,China;Geosciences School of Yangtze University,Wuhan 430100,China)

机构地区：[1]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [2]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [3]中国石油长庆油田分公司勘探事业部,陕西西安710018 [4]中国科学院西北生态环境资源研究院,甘肃兰州730000 [5]甘肃省油气资源研究重点实验室,甘肃兰州730000 [6]长江大学地球科学学院,湖北武汉430100

出　　处：《天然气地球科学》2021年第12期1771-1784,共14页Natural Gas Geoscience

基　　金：国家自然科学基金项目“湖盆细粒沉积动力学过程及主控因素研究——以鄂尔多斯盆地西南部延长组长7段为例”(编号:42102170);国家科技重大专项“鄂尔多斯盆地岩性油气藏区带评价与目标优选”项目(编号:2017ZX05001002);国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”项目(编号:2016ZX05050)联合资助.

摘　　要：鄂尔多斯盆地长7_(3)亚段发育一套富有机质泥页岩夹薄层粉—细砂岩的细粒沉积,具有整体生烃、普遍含油的特征。明确不同类型细粒沉积的含烃量、赋存状态、烃类组分等,对于该类型页岩油资源潜力分析和甜点优选具有重要意义。基于CY1井长7_(3)亚段岩心系统测试分析,运用多粒级多极性分步抽提方法,对黑色页岩、暗色泥岩、粉砂岩、细砂岩等4种细粒沉积岩石类型开展可动烃研究,评估了盆地长7_(3)亚段页岩油的可动烃资源量。结果表明,多粒级多极性分步抽提分析不同类型细粒沉积在不同粉碎条件下(1 cm^(3)、0.5 cm^(3)、150目)的含烃量及其组分,单位抽提量大小顺序为细砂岩>黑色页岩>粉砂岩>暗色泥岩,步骤1、步骤2抽提可溶有机质以轻质—中质组分为主,属于可动烃;步骤3和步骤4抽提可溶有机质为不可动烃。实验结果表明长7_(3)亚段黑色页岩、暗色泥岩、粉砂岩和细砂岩的可动烃量分别为3.35 mg/g、1.45 mg/g、3.28 mg/g和4.48 mg/g。对城80井区220 km^(2)长7_(3)亚段页岩油可动烃资源量进行评价,初步评价结果为(0.37~0.51)×10^(8) t。鄂尔多斯盆地长7_(3)亚段页岩油有利分布面积约为1.5×10^(4) km^(2)。通过类比分析,评价其可动烃资源量为(25~35)×10^(8) t,该类型页岩油有望成为盆地石油勘探新的接替领域。A set of fine-grained sediments of organic-rich shale interbedded with thin layer silt and fine grained sandstones developed in the Chang 7_(3) sub-member of the Ordos Basin.It has the characteristics of overall hydrocarbon generation and general oil-bearing.It is of great significance to clarify the hydrocarbon content,occurrence state and hydrocarbon components of different types of fine-grained sediments for the potential analysis and sweet spot selection of this type of shale oil resources.This study is based on the systemical core testing and analysis of the Chang 7_(3) sub-member of Well CY1,movable hydrocarbon research on four fine-grained sedimentary rock types is carried out,including black shale,dark mudstone,siltstone and fine-grained sandstone,by using multi-granular multi-polar sequential extraction methods,and the movable hydrocarbon resources of shale oil in the Chang 7_(3) sub-member is evaluated in the Ordos Basin.The research results show that the hydrocarbon content and its components of different types of fine-grained sediments under different particle size crushing conditions(1 cm^(3),0.5 cm^(3),150 mesh)are analyzed by multi-particle multi-polar sequential extraction.The unit extraction amount of hydrocarbon is fine-grained sandstone>black shale>siltstone>dark mudstone.The soluble organic matter extracted by step 1 and step 2 is mainly light-medium components and belongs to movable hydrocarbons.Soluble organic matter extracted by steps 3 and 4 is immobile hydrocarbon.Based on the above test methods,the movable hydrocarbon of black shale,dark mudstone,siltstone and fine sandstone in the Chang 7_(3) sub-member are 3.35 mg/g,1.45 mg/g,3.28 mg/g and 4.48 mg/g,respectively.The movable hydrocarbon resources of 220 km^(2) shale oil in Cheng 80 well block in the Chang 7_(3) sub-member were evaluated.The preliminary evaluation results were(0.37-0.51)×10^(8) t.The distribution area of shale oil in the Chang 7_(3) sub-member in the Ordos Basin is about 1.5×10^(4) km^(2).Through analogy analysis,it is

关 键 词：鄂尔多斯盆地 长7_(3)亚段页岩油 可动烃 多粒级多极性抽提 

分 类 号：TE122.2[石油与天然气工程—油气勘探]