扇三角洲层序地层特征及其油气汇聚规律——以东营凹陷胜北断层下降盘坨76块为例
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摘要
以东营凹陷胜北断层下降盘坨76块沙四上亚段扇三角洲沉积体为例,通过地质、地震、测井等资料对其层序地层单元进行了精确划分对比,将坨76块沙四上亚段扇三角洲沉积体共划分为4个准层序,18个层组,29个单层,并研究了各准层序及其内部层组特征及分布规律。研究发现在扇三角洲沉积体系中准层序及层组边界在地层记录中的表现形式随地理位置而变化。在上述基础上,探讨了扇三角沉积体系中最基本的准层序和层组2级层序地层单元与油气汇聚的关系,研究发现在完全由一种相构成的准层序、层组基准面旋回中,孔隙度和渗透率是A/S值变化的函数,在准层序及层组内部随A/S的变化,储层物性及其含油饱和度呈现一定的变化规律。
Taking the Tuo76 fan-delta of the upper part of the 4th member of the Shahejie Formation on the downthrown side of the Shengbei fault in the Dongying depression as an example,this paper deals with the characteristics and distribution pattern of parasequnces in a fan-delta depositional system.Based on geological,seismic and well logging data,theTuo76 fan-delta is divided into 4 parasequnces,18 bed sets and 29 beds.Our data show that the occurrence and boundaries of the parasequences and bed sets change with time.Oil-gas accumulation is related to the distribution of parasequnces and bed sets.The change in porosity and permeability of the reservoir is a function of A/S(Accommodation space/sediment supply) in the parasequence and bed sets consisting of one facies.And reservoir properties and oil-gas saturation show similar pattern of variation.
Taking the Tuo76 fan-delta of the upper part of the 4th member of the Shahejie Formation on the downthrown side of the Shengbei fault in the Dongying depression as an example,this paper deals with the characteristics and distribution pattern of parasequnces in a fan-delta depositional system.Based on geological,seismic and well logging data,theTuo76 fan-delta is divided into 4 parasequnces,18 bed sets and 29 beds.Our data show that the occurrence and boundaries of the parasequences and bed sets change with time.Oil-gas accumulation is related to the distribution of parasequnces and bed sets.The change in porosity and permeability of the reservoir is a function of A/S(Accommodation space/sediment supply) in the parasequence and bed sets consisting of one facies.And reservoir properties and oil-gas saturation show similar pattern of variation.
引文
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[5]张尚锋,洪秀娥,郑荣才,等.应用高分辨率层序地层学对储层流动单元层次性进行分析——以泌阳凹陷双河油田为例[J].成都理工学院学报,2002,29(2):147-151.
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[13]张春生,刘忠保,施冬,等.扇三角洲形成过程及演变规律[J].沉积学报,2000,18(4):521-527.
[14]贾爱林,穆龙新,陈亮,等.扇三角洲露头区沉积模拟[J].石油学报,2000,21(6):107-110.
[15]武法东,陈永进,李寅.河北滦平盆地构造演化及对扇三角洲发育的控制作用[J].现代地质,2000,14(2):179-184.
[16]焦养泉,周海明,庄新国,等.扇三角洲沉积体系及其与油气聚集关系.沉积学报[J].2000,18(1):70-75.
[17]陈永进,武法东.滦平盆地桑园营子露头剖面沉积层序的Markov链模拟[J].现代地质,2000,14(4):444-458.
[18]陈程,孙义梅,邓宏文.油田开发后期扇三角洲前缘微相分析及应用[J].现代地质,2001,15(1):88-93.
[19]赵俊青,纪友亮,夏斌,等.扇三角洲沉积体系高精度层序地层学研究[J].沉积学报.2004,22(2):302-309.
[2]林畅松,张燕梅,刘景彦,等.高精度层序地层学和储层预测[J].地学前缘,2000,7(3):110-117.
[3]许广明,徐怀大,孔祥言.高分辨率层序地层学在油藏数值模拟中的应用[J].石油与天然气地质,1999,20(2):115-119.
[4]段秋梁,武法东,陈建渝,等.渤南油田9砂层组高分辨率层序特征及其沉积演化[J].现代地质,2001,15(1):83-87.
[5]张尚锋,洪秀娥,郑荣才,等.应用高分辨率层序地层学对储层流动单元层次性进行分析——以泌阳凹陷双河油田为例[J].成都理工学院学报,2002,29(2):147-151.
[6]肖玉茹,何峰煜.高分辨层序地层学在储层预测中的应用[J].石油实验地质,2003,25(2):169-173.
[7]郑荣才,彭军,彭光明,等.高分辨率层序分析在油藏开发工程中的应用[J].沉积学报,2003,21(4):654-662.
[8]Van Wagoner J C,et al.Siliciclastic sequence stratigraphy inwell logs,cross and outcrops[C]//AAPG Methods in Ex-ploration Series.1990(7):1-55.
[9]Cooper M R.Tectonic cycles in Southern Africa[J].EarthScience Review,1990,28(4):321-364.
[10]Mitchum R M,Van Wanger J C.High frequency andtheir stacking patterns:sequence stratigraphic evidence ofhigh frequency eustatic cycles[J].Sedimentary Geology,1991,70(2):131-160.
[11]Vail P R,Audemard F R,Bowman S A,et al.The strati-graphic signatures of tectonics,eustasy and sedimentolo-gy-an overview[C]//Einsele G,Richen W,Seilacher Aeds.Cycles and events in stratigraphy.Berlin:Heidel-berg:Spring-Verlag.1991:617-659.
[12]李思田.含能源盆地沉积体系——中国内陆和近海主要沉积体系类型的典型分析[M].武汉:中国地质大学出版社,1996:97-106.
[13]张春生,刘忠保,施冬,等.扇三角洲形成过程及演变规律[J].沉积学报,2000,18(4):521-527.
[14]贾爱林,穆龙新,陈亮,等.扇三角洲露头区沉积模拟[J].石油学报,2000,21(6):107-110.
[15]武法东,陈永进,李寅.河北滦平盆地构造演化及对扇三角洲发育的控制作用[J].现代地质,2000,14(2):179-184.
[16]焦养泉,周海明,庄新国,等.扇三角洲沉积体系及其与油气聚集关系.沉积学报[J].2000,18(1):70-75.
[17]陈永进,武法东.滦平盆地桑园营子露头剖面沉积层序的Markov链模拟[J].现代地质,2000,14(4):444-458.
[18]陈程,孙义梅,邓宏文.油田开发后期扇三角洲前缘微相分析及应用[J].现代地质,2001,15(1):88-93.
[19]赵俊青,纪友亮,夏斌,等.扇三角洲沉积体系高精度层序地层学研究[J].沉积学报.2004,22(2):302-309.
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