摘要
车镇凹陷沙二段沉积时期发育了一定规模的滩坝砂体,对于其沉积迁移规律等的认识不够深入,制约了滩坝砂油藏的精细勘探开发进程。为了进一步明确研究区滩坝砂体的沉积迁移规律,在充分利用岩心、录井、测井及相关测试资料的基础上,系统研究了滩坝砂体的沉积特征及控制因素。结果表明:车镇凹陷沙二段滩坝砂体以岩屑长石砂岩为主,粒度概率曲线以反映波浪作用的跳跃加悬浮式和两段跳跃加悬浮式为主;滩坝砂体沉积构造类型多样,主要发育反映波浪作用的浪成沙纹交错层理和沙纹交错层理、反映强水动力作用的平行层理,以及反映生物作用的生物钻孔和生物扰动构造;滩坝砂体主要为原地改造型,垂向上主要发育反粒序特征明显的坝砂和相序不明显的滩砂,局部地区发育由于波浪作用改造不彻底而形成的正粒序或复合相序;断层活动控制了滩坝砂体的沉积迁移规律,波浪作用控制了原地改造型滩坝的发育,物源供给控制了滩坝砂体的发育规模;整体上,车镇凹陷沙二段滩坝砂体具有"漫湖"沉积特征,成分成熟度和结构成熟度均中等偏低。研究结果可为车镇凹陷沙二段滩坝砂油藏的进一步勘探开发提供参考。
A certain scale of beach-bar sandbodies were developed during the sedimentary stage of the second member of Shahejie Formation in Chezhen Sag.The understanding of the law of sedimentation and migration of beach-bar sandbodies is not yet deep enough,which restricts the process of fine exploration and development of beach-bar sandbody reservoirs.In order to further clarify the law of sedimentation and migration of beach-bar sandbodies,the sedimentary characteristics and controlling factors of the beach-bar sandbodies were studied by integrating the data of core,drilling,logging and relevant test data.The results show that the beach-bar sandbodies were dominated by debris-feldspar sandstones,the grain size probability curves mainly include patterns of“1 skip+1 suspension”and“2 skip+1 suspension”representing wave deposition.Several types of sedimentary structures were developed in beach-bar sandbodies,mainly including wave-ripple cross-bedding and ripple crossbedding with wave influence,horizontal bedding reflecting strong hydrodynamic force,burrow pores and bioturbation structures indicating biological effect.The beach-bar sandbodies were reconstructed in-situ,which mainly developed bar facies with obvious inverted sequence,beach facies with indistinct inverted sequence and beachbar facies with positive sequence and composite sequence vertically due to the role of wave transforming incompletely in partial area.The fault activities controlled the deposits and migrations of the beach-bar sandbodies,wave actions controlled the development of the in-situ reconstructed beach-bar sandbodies,and the supplies of material sources controled the development scales of the beach bar sandbodies.The beach-bar sandbodies were entirely distributed in overall basin with characteristics of over-lake deposition with meidium-low compositional and structural maturity during the sedimentation of the second member of Shahejie Formation in Chezhen Sag.The results can provide a reference for the further exploration and development of
作者
时瑞坤
高秋菊
韩小锋
巴素玉
师涛
韩敏
SHI Ruikun;GAO Qiuju;HAN Xiaofeng;BA Suyu;SHI Tao;HAN Min(Geophysical Research Institute,Shengli Oilfield Company,Sinopec,Dongying 257022,Shandong,China;Xi’an center of Geological Survey,CGS,Xi’an 710054,China;Research Institute of Petroleum Exploration and Development,Shengli Oilfield Company,Sinopec,Dongying 257000,Shandong,China)
出处
《岩性油气藏》
CSCD
北大核心
2018年第2期50-57,共8页
Lithologic Reservoirs
基金
国家重大科技专项"大型油气田及煤层气开发"子课题"致密油藏储层地震预测方法及地应力研究"(编号:2017ZX05072001)
国家重点基础研究发展计划(973计划)项目"陆相页岩油富集要素与有利区预测"(编号:2014CB239104)
中国石化油气勘探开发领域重大项目"济阳坳陷油气聚集规律及精细评价关键技术"子课题"复杂隐蔽油气藏地震勘探关键技术研究"(编号:ZDP17008)联合资助
关键词
滩坝
沉积特征
控制因素
沙二段
车镇凹陷
beach-bar
sedimentary characteristics
controlling factors
the second member of Shahejie Formation
Chezhen Sag
