金湖凹陷南部阜三段—阜四段沉积相及其演化研究
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摘要
通过对岩石类型、沉积构造和测井相进行综合分析,系统研究了金湖凹陷南部阜三段-阜四段沉积相类型及演化模式。研究表明:阜三段时期盆地主要发育三角洲前缘—前三角洲—滨浅湖沉积,物源来源于张八岭隆起和建湖隆起,根据沉积层序特征进一步划分水下分流河道、水下河道间湾、河口坝、远砂坝、前缘席状砂、前三角洲泥以及滨浅湖泥微相。西南部汊涧斜坡带主要发育为朵形三角洲沉积,东北部发育长形三角洲沉积。阜四段沉积期盆地基底沉降,湖平面上升,在汊涧斜坡带发育小型三角洲,东北部为滨浅湖—半深湖相沉积。研究区沉积旋回总体表现为进积→退积→进积→退积的演化模式,砂体的分布范围经历扩大→缩小→扩大→缩小的变化趋势,表明沉积相的演化规律对砂体的发育特征具有控制作用。
The sedimentary facies and evolution of the third and fourth members of Funing Formation in Southern of Jinhu sag are studied through comprehensive analyses of rock types,grain size,sedimentary structural features and logging facies. The study shows that delta front,prodelta,shore shallow lake sedimentary systems were developed in the third member of Funing Formation in researched areaand can be further divided into sedimentary microfacies of underwater distributary channel,mouth bar,distal bar,frontal sand sheet,underwater distributary interchannel,predelta mud and mud in shore-shallow lake.The sediments were derived from Zhang-baling uplift and Jianhu uplift. The base of the basin subsided with lake transgression in the fourth member of Funing Formation sedimentary period. The small delta was developed in Chajian slope and the northeast part developed shore shallow lake,semi deep lake facies.The evolution model of sedimentary cycle was progradation-retrogradation-progradation-retrogradation and variation trend of the Sand body distribution was increasing-decreasing-increasing-decreasing. It shows the growth characteristics of sand body were controlled by the evolution rule of sedimentary facies.
The sedimentary facies and evolution of the third and fourth members of Funing Formation in Southern of Jinhu sag are studied through comprehensive analyses of rock types,grain size,sedimentary structural features and logging facies. The study shows that delta front,prodelta,shore shallow lake sedimentary systems were developed in the third member of Funing Formation in researched areaand can be further divided into sedimentary microfacies of underwater distributary channel,mouth bar,distal bar,frontal sand sheet,underwater distributary interchannel,predelta mud and mud in shore-shallow lake.The sediments were derived from Zhang-baling uplift and Jianhu uplift. The base of the basin subsided with lake transgression in the fourth member of Funing Formation sedimentary period. The small delta was developed in Chajian slope and the northeast part developed shore shallow lake,semi deep lake facies.The evolution model of sedimentary cycle was progradation-retrogradation-progradation-retrogradation and variation trend of the Sand body distribution was increasing-decreasing-increasing-decreasing. It shows the growth characteristics of sand body were controlled by the evolution rule of sedimentary facies.
引文
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[2]高炎,李维锋,施小荣.金湖凹陷范庄油田阜宁组层序划分及沉积相分析[J].石油天然气学报,2008,30(5):225-227.
[3]王洪艳.金湖凹陷构造特征研究及目标评价[D].中国石油大学,2011.
[4]能源,漆家福,张春峰,等.金湖凹陷断裂特征及其石油地质意义[J].大地构造与成学,2012,36(1):16-23.
[5]张宏国,戴俊生,王霞田,等.苏北盆地金湖凹陷西斜坡构造特征及构造演化[J].地球科学与环境学报,2011,33(4):349-353.
[6]王霞田.金湖凹陷西斜坡阜宁组构造沉积演化研究[D].中国石油大学,2011.
[7]刘军,刘喜玲,田骏.苏北盆地金湖凹陷油气运移与聚集规律[J].石油天然气学报(江汉石油学院学报),2005,27(6):693-694.
[8]韩园园.金湖凹陷南部油气成藏规律研究[D].中国石油大学,2011.
[9]冯增昭.沉积岩石学[M].北京:石油工业出版社,1993.
[10]张金亮,司学强,林辉.金湖凹陷阜三段沉积相分析[J].中国海洋大学学报(自然科版),2006,36(4):535-539.
[11]商琳,戴俊生,王霞田,等.金湖凹陷西斜坡阜宁期构造-沉积演化与油气聚集[J].沉积与特提斯地质,2013,33(4):33-39.