沿岸流控湖泊三角洲沉积演化特征研究  

Sedimentary Evolution of the Lake Delta Controlled by Coast Current

作　　者：邱隆伟[1,2] 白立科 杨勇强 葛君[3] 韩晓彤 Qiu Longwei;Bai Like;Yang Yongqiang;Ge Jun;Han Xiaotong(China University of Petroleum (East China),Qingdao,Shandong 266580,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory forMarine Science and Technology (Qingdao),Qingdao,Shandong 266071,China;Sinopec Shengli Oilfield Branch Company,Dongying,Shandong 257077,China)

机构地区：[1]中国石油大学(华东),山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]中国石化胜利油田分公司,山东东营257077

出　　处：《特种油气藏》2019年第5期14-20,共7页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“近岸深水粗碎屑岩沉积构型与有利储层评价”(2017ZX05009-002)

摘　　要：孤北洼陷南部鼻状构造带沙二-沙三中亚段沉积时期发育了沿岸流控湖泊三角洲沉积。为弄清沿岸流对三角洲沉积演化的控制作用及演化特征,通过岩心观察、粒度分析等手段,结合测井、录井、地震等资料,对研究区三角洲的沉积演化进行详细分析。结果表明:研究区南部缓坡带主要以三角洲沉积为主,三角洲前缘亚相分布面积广泛,粒度特征及岩心观察指示其前缘砂体受强水动力影响,发育大量浪成构造且平面上侧向迁移明显;测井资料及沉积体系发育展布表明了沿岸流作用对其发育演化的控制作用;前缘亚相呈不对称形态,砂坝发育明显,虽受物源供给影响,但沙二-沙三中亚段时期受沿岸流作用控制,导致三角洲向湖盆内推进受到抑制。总体上,沿岸流对于三角洲砂体平面展布及相带发育起到重要的改造作用,对古地貌及古风向的恢复,以及在下一步油气勘探中,有必要考虑沿岸流作用对储层发育和展布所造成的影响。研究结果对孤北洼陷下步勘探具有一定指导意义。Lake delta deposit with the control of coast current had developed within the sedimentary stage of Sha2-Sha3 Subsection in the nasal tectonic belt of Gubei Sag.In order to clarify the effects of coast current on the delta sedimentary evolution and characterize the sedimentary evolution,the delta sedimentary evolution in this area was analyzed in detail based on the core observation,particle analysis,logging,mud logging,seismic and other data.Result shows that the gentle slope zone in the southern part is dominated by delta deposit with wide distribution of delta front sub-facies.The particle analysis and core observation indicate that the leading edge sandbodies are controlled by strong hydrodynamics,which results in a large number of wave structures with significant lateral migration.Logging data and sedimentary system distribution indicate the effect of coast current on its development and evolution.The leading edge sub-facies with well-developed sand dams shows asymmetrical form.Although there is the effect of provenance supply,the advancing of delta to the lake basin was still suppressed by the control of coast current within the sedimentary stage of Sha2-Sha3 Subsection.Generally,the coast current plays an important role in the transformation of lateral delta sandbody distribution and facies development.The effects of coast current on reservoir development and distribution should be considered in the restoration of paleo-geomorphology and paleo-wind and the hydrocarbon exploration in the future.This research could provide certain guidance for the next hydrocarbon exploration in the Gubei Sag.

关 键 词：沿岸流 三角洲 浪成构造 沉积演化 孤北洼陷 

分 类 号：TE121.3[石油与天然气工程—油气勘探]