煤系砂岩储层粒度定量评价图版建立及油气富集区预测——以准噶尔盆地玛湖凹陷西斜坡Aih12井区八道湾组为例  

Quantitative evaluation of particle-size in coal-based sandstone reservoirs and the prediction of oil and gas accumulation area:Taking J_1b group,Aih12 block in west slope of Mahu sag,Junggar basin,for example

作　　者：孟祥超 陈扬 谢天寿 王爱霞[2] 郭友哲 窦洋 

机构地区：[1]中国石油勘探开发研究院杭州地质研究院,浙江杭州310023 [2]中国石油新疆油田公司勘探开发研究院,新疆克拉玛依834000 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《东北石油大学学报》2017年第6期15-25,共11页Journal of Northeast Petroleum University

基　　金：中国石油"新疆大庆"科技攻关项目(HX132-41655)

摘　　要：为明确煤系薄层砂岩储层油气富集区展布,利用"地质主因分析—测井图版界定—地震定量预测"研究思路,以准噶尔盆地玛湖凹陷西斜坡Aih12井区八道湾组为例,分析研究区16口井183个岩心样品的粒度刻度(岩心—铸体薄片交互验证)—测井归位,比较不同粒度储层塑性岩屑体积分数及压实减孔效应,建立基于自然伽玛曲线的煤系砂岩储层定量评价图版并预测油气富集区。结果表明:粒度为煤系砂岩储层质量的关键控制因素,物性、含油性较优的高效储层主要为粒度较粗的(含砾)粗砂岩和(粗)中砂岩;根据砂岩界定标准(38<GR≤80API)、高效储层界定标准(38<GR≤51API),通过自然伽玛曲线反演实现砂地比、高效储层平面展布预测,综合适中砂地比、高效储层和良好烃源岩—储层沟通条件等油气富集要素,优选A-F共6块油气富集区,累计面积为44.8km2,为准噶尔盆地及其他盆地煤系砂岩高效储层定量评价及预测提供借鉴。In order to clarify the distribution of oil and gas accumulation zone in the thin layer coal-based sandstone reservoir,following the research approach of " Analysis of the geological main causes—Definition with log chart-quantitative prediction with seismic",and by means of the study of relation of granularity to logging in 16 wells( 183 core sample points) and the analysis of plastic debris volume fraction and compaction-cut-hole effect contrast in different particle-size,this paper draws conclusions that particle-size is the key control factors of the quality of coal-based sandstone reservoir. The high efficient reservoir with high oil content is mainly coarse-middle sandstone. Based on GR curve,a quantitative evaluation chart of coal sandstone reservoir is established. According to the definition standard of sandstone( 38 < GR≤80 API) and efficient reservoir( 38 < GR≤51 API),the quantitative prediction of sand/ground ratio and high efficiency reservoir is achieved through GR inversion.The three elements of oil and gas enrichment are " moderate sand/ground ratio( 40% ~ 60%),scale efficient reservoir( coarse-middle sandstones,thickness is more than 4 m,connected area is greater than 5 km2),and good source-reservoir communication conditions( source-reservoir communication faults) ". On the basis of elements of oil and gas enrichment above mentioned,this paper preferred six pieces of oil and gas accumulation zone( A F),the total area of which are 44. 8 km2. It will help to evaluate and predict the efficient coal-based sandstone reservoir in Junggar basin and other basins.

关 键 词：玛湖斜坡区 八道湾组 煤系砂岩储层 砂地比 高效储层 通油源断裂 评价图版 油气富集区 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]