准噶尔盆地滴南凸起白垩系清水河组层序地层划分及沉积特征  

Sequence stratigraphic classification and sedimentary characteristics of Cretaceous Qingshuihe Formation in the Dinan uplift of Junggar Basin

作　　者：樊奇[1] 朱爱国[2] 田继军[1] 李林[3] 

机构地区：[1]新疆大学地质与矿业工程学院,新疆乌鲁木齐830047 [2]新疆石油学院勘探系,新疆乌鲁木齐830000 [3]中国石油新疆油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《油气地质与采收率》2015年第4期38-43,共6页Petroleum Geology and Recovery Efficiency

基　　金：新疆维吾尔自治区自然科学基金项目"准噶尔盆地南缘二叠系芦草沟组岩相古地理特征与油页岩资源潜力评价"(2011211B02)

摘　　要：准噶尔盆地滴南凸起是陆东地区重要的油气聚集区带,其油气源条件优越,储盖配置良好,已于石炭系—白垩系多个层系获得工业油气流,但对其白垩系的研究尚欠深入。为此,以层序地层学理论为指导,基于地震资料和60口探井的录井、测井资料,对滴南凸起白垩系清水河组进行详细的地层对比及划分,进而分析其层序地层特征、沉积特征及演化。研究结果表明,研究区清水河组自下而上可划分为清一段、清二段、清三段、清四段和清五段,且清一段—清四段发育的底砾岩层具有穿时的现象;清水河组可划分为1个三级层序,由下至上发育的低位体系域、湖侵体系域和高位体系域构成了一套完整的湖平面变化周期;在平面上可识别出辫状河三角洲相和湖泊相,以及物源方向由西北至东部的变化。研究区辫状河三角洲相良好的储集条件与底砾岩层的穿时分布为地层和岩性油气藏的形成提供了有利条件,沿清一段—清四段4条超覆尖灭带分布的底砾岩层可成为下步油气勘探的有利目标。Dinan uplift of Junggar Basin is an important hydrocarbon accumulation zone in Ludong area with better hydrocarbon source and good reservoir-cap configuration,where industrial oil flow has been discovered in several strata from Carboniferous to Cretaceous. But the Cretaceous was lack of systematic research. Cretaceous Qingshuihe Formation has been correlated and divided in detail based on seismic data and logging data from 60 wells guided by sequence stratigraphic theory,and then its sequency stratigraphic characteristics,sedimentary characteristics and evolution were analyzed. The research results show that the Qingshuihe Formation can be divided into K1q1,K1q2,K1q3,K1q4 and K1q5from bottom to top,and basal conglomerate strata in the K1q1-K1q4 distributed diachronously. The Qingshuihe Formation was identified as a third order sequence which consists of LST,TST and HST from bottom to top and forming a complete set of lake level change cycle. Braided river delta facies and lacustrine facies were identified and provenance changed from north-west to south in a plane. Good reservoir conditions in the braided river delta and diachronous distribution of basal conglomerateprovide favorable conditions for hydrocarbon accumulating in stratigraphic and lithologic reservoirs. The basal conglomerate distributed along four overlap pinching out belts in the K1q1 to K1q4could be regarded as next exploration targets.

关 键 词：地层油气藏 岩性油气藏 层序地层特征 沉积演化 清水河组 滴南凸起 

分 类 号：TE111.3[石油与天然气工程—油气勘探]