陆相页岩油可动烃富集因素与古龙页岩油勘探潜力评价  

Enrichment factors of movable hydrocarbons in lacustrine shale oil and exploration potential of shale oil in Gulong Sag,Songliao Basin,NE China

作　　者：赵文智[1,2] 卞从胜[1,2] 李永新[1,2] 张金友[3] 何坤[2] 刘伟[1,2] 张斌[2] 雷征东[2] 刘畅[2] 张婧雅[2] 关铭 刘诗局 ZHAO Wenzhi;BIAN Congsheng;LI Yongxin;ZHANG Jinyou;HE Kun;LIU Wei;ZHANG Bin;LEI Zhengdong;LIU Chang;ZHANG Jingya;GUAN Ming;LIU Shiju(ZWZ Academician Research Studio,PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Exploration and Development Research Institute of PetroChina Daqing Oilfield Company,Daqing 163712,China)

机构地区：[1]中国石油勘探开发研究院赵文智院士工作室,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]中国石油大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《石油勘探与开发》2023年第3期455-467,共13页Petroleum Exploration and Development

基　　金：国家自然科学基金委员会联合基金项目“中低成熟度陆相页岩油资源形成与原位转化开采机理”(U22B6004);中国石油勘探开发研究院院级项目“典型陆相中高熟页岩油富集特征与富集区评价”(2022yjcq03)。

摘　　要：通过对中国主要中高熟页岩油探区的地质特征和生产实践分析,结合分析化验结果,提出陆相页岩油能否投入规模开发需要兼备3个条件:初始产量有经济性、单井累计采油量有经济性与经试采证实的可动用储量有规模,明确了可动烃数量与品质是决定页岩油能否经济开发的关键,也是页岩油富集区/段评价需要关注的重点。研究提出可动烃富集评价指标包括:(1)形成滞留烃的物质基础,以TOC>2%为必要条件,3%~4%最好,母质类型为Ⅰ—Ⅱ1型;(2)滞留烃流动性,与烃组分构成及其中轻/重烃组分流动特征密切相关,可从热成熟度(R_(o))、气油比(GOR)、原油密度、烃组分构成品质、保存条件等方面评价;(3)工程关联要素,包括孔喉主分布区、储集物性(含裂缝)、页理特征与成岩阶段。据此建立3类13项评价指标及参考值,评价认为古龙页岩油轻质油带可动烃富集条件最有利,其次为稀油带和黑油带,其中R_(o)>1.2%、压力系数大于1.4、有效孔隙度大于6%、原油密度小于0.82 g/cm^(3)与GOR>100m^(3)/m^(3)的轻质油资源量20.8×10^(8)t。古龙页岩油可依据页岩油流动特征,按资源甜点、工程甜点和致密油型甜点分类勘探开发,是中国最具希望实现规模突破和建产的陆相页岩油分布区。The geological characteristics and production practices of major middle-and high-maturity shale oil exploration areas in China are analyzed.Combined with laboratory results,it is clear that three essential conditions,i.e.economic initial production,commercial cumulative oil production of single well,and large-scale recoverable reserves confirmed by the testing production,determine whether the continental shale oil can be put into large-scale commercial development.The quantity and quality of movable hydrocarbons are confirmed to be crucial to economic development of shale oil,and also focuses in evaluation of shale oil enrichment area/interval.The evaluation indexes of movable hydrocarbon enrichment include:(1)the material basis for forming retained hydrocarbon,including TOC>2%(preferentially 3%–4%),and typeⅠ-Ⅱ1 kerogens;(2)the mobility of retained hydrocarbon,which is closely related to the hydrocarbon composition and flow behaviors of light/heavy components,and can be evaluated from the perspectives of thermal maturity(R_(o)),gas-oil ratio(GOR),crude oil density,quality of hydrocarbon components,preservation conditions;and(3)the reservoir characteristics associated with the engineering reconstruction,including the main pore throat distribution zone,reservoir physical properties(including fractures),lamellation feature and diagenetic stage,etc.Accordingly,13 evaluation indexes in three categories and their reference values are established.The evaluation indicates that the light shale oil zones in the Gulong Sag of Songliao Basin have the most favorable enrichment conditions of movable hydrocarbons,followed by light oil and black oil zones,containing 20.8×10^(8)t light oil resources in reservoirs with R_(o)>1.2%,pressure coefficient greater than 1.4,effective porosity greater than 6%,crude oil density less than 0.82 g/cm^(3),and GOR>100 m^(3)/m^(3).The shale oil in the Gulong Sag can be explored and developed separately by the categories(resource sweet spot,engineering sweet spot,and tight oil sweet spot)d

关 键 词：古龙凹陷 陆相页岩油 可动烃富集因素 富集区/段评价 物质基础 烃组分流动 工程关联要素 

分 类 号：TE122[石油与天然气工程—油气勘探]