致密储层岩性精准评价及毫米级样品油源精细对比--以松辽盆地北部QP1井为例  

Accurate lithologic evaluation of tight reservoirs and fine oil-source correlation of millimeter-scale samples:a case study of the QP1 well in northern Songliao basin

作　　者：张居和[1,2] 张博为 冯子辉 邵红梅[1,2] 霍秋立[1,2] 鄢仁勤 ZHANG Juhe;ZHANG Bowei;FENG Zihui;SHAO Hongmei;HUO Qiuli;YAN Renqin(Exploration and Development Research Institute,Daqing Oilfield CompanyLtd.,Daqing,Heilongjiang,163712;Heilongjiang Provincial Key Laboratory for the Study of Tight Oil and Shale Oil Accumulation,Daqing,Heilongjiang 163712,China;College of Earth Science,Northeast Petroleum University,Daqing,Heilongjiang 163318,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]黑龙江省致密油和泥岩油成藏研究重点实验室,黑龙江大庆163712 [3]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《地质学报》2020年第5期1538-1550,共13页Acta Geologica Sinica

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“大庆探区非常规油气勘探开发关键技术研究与现场试验”(编号2012E-2603);黑龙江省博士后资助项目“不同时期油源断裂输导油气优势路径及其分布”资助的成果。

摘　　要：致密储层岩性精准评价与油源精细对比是致密油和泥页岩油"七性"评价及勘探开发的重要基础。本文以松辽盆地北部QP1井为例,采用厘米级、毫米级与微米级"三尺度"有机结合的岩性精细准确描述方法,对致密储层岩性精准描述评价结果表明,同一井段岩性条带由常规描述的11个,增加到厘米级精准描述的14个、毫米级精准描述的135个;不同沉积相砂地比三角洲外前缘相由常规描述的17.16%增大到精准描述的29.87%,三角洲内前缘相由45.29%增大到47.55%,滨浅湖相由6.53%增大到9.93%,定量评价了不同陆相沉积相致密储层岩性和储集性。在致密岩性精准描述评价基础上,建立了毫米级岩石样品精确取样及烃类分析技术,致密储层及毫米级样品油源精细对比及含油性评价表明,同一泥岩段及厘米-毫米级薄砂条中烃类特征类似,薄砂条与上下接触的泥岩可能构成生储盖组合;不同泥岩段烃类特征差别明显,其生油母质类型和成熟度接近;不同砂岩段储层烃类特征差别明显,与各自下伏泥岩段的类似,纵向上泥岩厚度2.9m、砂岩厚度1.1m即可构成生储盖组合,具有"下生上储"近源聚集的源储配置关系;指出了三角洲内前缘相为致密油,外前缘相为致密油和泥页岩油,滨浅湖相为泥页岩油勘探有利区的部署方向。Accurate lithologic evaluation of tight reservoirs and fine oil-source correlation are the important basis for"seven characteristics"evaluation and exploration and development of tight oil and shale oil.Taking the QP1 well in the northern part of the Songliao Basin as an example,this study employed the method of precise and accurate description of lithology with "three scales"of centimeter,millimeter and micron,to analyze accurate description and evaluation of dense reservoirs.The results indicate that the lithologic strips in the same section increase from 11 conventional ones to 14 precise description by centimeter level and 135 by millimeter level.The outer front facies of delta in different sedimentary facies with various ratios of total sandstone thickness to formation thickness increases from the conventionally described17.16%to the accurately described 29.87%,the inner front facies of delta increases from 45.29% to47.55%,and the shore-shallow lake facies increases from 6.53%to 9.93%.The lithology and reservoir properties of compact reservoirs with different continental sedimentary facies were quantitatively evaluated.Based on the accurate description and evaluation of tight lithology,precise sampling and hydrocarbon analysis techniques for millimeter-scale rock samples are established.Fine oil-source correlation and oil-bearing evaluation of tight reservoirs and millimeter-scale samples show that the same mudstone section and centimeter-millimeter thin sand strips are identical in hydrocarbon characteristics,the thin sand strips and their contact mudstones can constitute a source-reservoir-cap assemblage;the hydrocarbon characteristics of different mudstone sections are obviously different,and the type and maturity of the source material are similar;the hydrocarbon characteristics of reservoirs in different sandstone sections are obviously different,but similar to the underlying mudstone formations,and vertical mudstone thickness of 2.9 mand sandstone thickness of 1.1 mcan form source-reservoir-cap assembl

关 键 词：松辽盆地北部 QP1井 致密储层 岩性精准评价 毫米级 油源 精细对比 

分 类 号：TE34[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]