准东地区阜康凹陷南部中下侏罗统沉积特征与沉积演化模式  

Sedimentary Characteristics and Evolution Model of the Middle-Early Jurassic on the South of Fukang Sag in Eastern Junggar Basin

作　　者：陈丹丹[1,2] 吉鸿杰[1,2] 陶辉飞[1] 云正文 王琪[1] 郑建京[1] 马晓峰[1] 韩元红[4] 马东旭[1,2] 

机构地区：[1]甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]中国石油长庆油田分公司油藏评价处,陕西西安710018 [4]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214151

出　　处：《天然气地球科学》2015年第11期2093-2106,共14页Natural Gas Geoscience

基　　金：中国科学院西部行动计划项目"准噶尔盆地东部低熟气资源潜力与有利勘探区预测(编号:KZCX2-XB3-12)";"甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室开放课题(编号:1309RTSA041)"联合资助

摘　　要：准东地区侏罗系既是重要的储集层也是主要的烃源层,具有丰富的油气资源。位于阜康凹陷南部的甘河子剖面出露连续完整的中—下侏罗统,通过对甘河子剖面精细地分层观察描述,并以岩石的类型及其组合、沉积构造、颜色和粒度概率累计曲线等实测资料为依据,对研究区中—下侏罗统的沉积相进行了划分,认为八道湾组下部为曲流河相,中部发育滨浅湖亚相,上部以三角洲前缘亚相和滨浅湖亚相为主;三工河组下部发育辫状河相,上部主要为滨浅湖沉积;西山窑组主要发育辫状河和曲流河2种沉积相类型。在此基础上提出研究区为曲流河—湖泊—三角洲—湖泊—辫状河—湖泊—辫状河—曲流河相结合的沉积演化模式。研究区古水流资料显示八道湾组和三工河组沉积期的古流向多在SSW向—SW向之间,结合沉积相的相序变化规律,表明八道湾组、三工河组属于克拉美丽山前沉积体系,该时期博格达山地区为水下沉积;西山窑组古流向的优势方位为NW向、NWW向,推测该时期研究区东部和东南部的物源已经存在,北三台地区及博格达山东部地区可能发生初步抬升,阜康凹陷南部地区沉积构造格局较早侏罗世发生较大变化。The Jurassic in the eastern Junggar Basin is not only an important reservoir stratum,but also a main hydrocarbon source layer,so that it has abundant oil and gas resources.The measured section named after its location is called Ganhezi section,which is in the southern of Fukang Sag of eastern Junggar Basin.Ganhezi section consists of the successive Early-Middle Jurassic.By means of observing and describing the Ganhezi section elaborately,and according to the measured data of rock types,sedimentary structure,rock color and grain size probability accumulative curves,the author analyses the sedimentary facies of the Early-Middle Jurassic in detail.The research of sedimentary facies indicates that Badaowan Formation comprises fluvial facies,shallow lacustrine subfacies and delta front subfacies;Sangonghe Formation consists of braided river facies and shallow lacustrine subfacies;Xishanyao Formation comprises braided river facies and fluvial facies.Based on sedimentary characteristics and the variation of sedimentary facies,an evolutionary model with fluvial facies-lacustrine facies-delta facies-lacustrine facies-braided river facies-lacustrine facies-braided river facies-fluvial facies integrated is proposed.Paleocurrent measurements show that the main paleocurrent direction of Badaowan Formation and Sangonghe Formation were SSW-SW,and according to the Walther′s sedimentary facies sequence law,the provenance of Badaowan Formation and Sangonghe Formation were Kelameili Mountain and the region of Boegda Mountain was subaqueous deposit.The paleocurrent direction of Xishanyao Formation was NW-NWW,which indicates that the provenance was in the east and southeast of the study area.The author speculates that the Beisantai and eastern region of Bogeda Mountain had uplifted preliminarily and the tectonic framework of the eastern Junggar Basin had a great change from Middle Jurassic.

关 键 词：准噶尔盆地 甘河子地区 中—下侏罗统 沉积相 古流向 演化模式 

分 类 号：TE121[石油与天然气工程—油气勘探]