摘要
论文以赛汉塔拉凹陷北部下白垩为研究对象,以层序地层学和沉积学理论为指导,综合地质、测井、地震以及试油资料开展了该地区层序地层和沉积相及储层特征的研究。
运用井震结合的方法,将赛汉塔拉凹陷下白垩统阿尔善组到腾二段划分为3个三级层序(层序S1、S2、S3),六个四级层序(层序S1-1、S1-2、S2-1、S2-2、S3-1、S3-2)。在此基础上,并进行了中期和短期基准面旋回的划分,建立起研究区内的层序地层格架。
以相标志的分析为基础,结合单井相和剖面相分析,提出了下白垩统主要发育冲积扇、扇三角洲、近岸水下扇、辫状河三角洲、湖泊相和浊积扇等沉积相类型。
平面上,层序S1沉积时期,北部主要发育冲积扇沉积相、东南部发育近岸水下扇沉积;层序S2、S3沉积时期,北部发育辫状河三角洲相,西部查干斜坡带主要发育河流-辫状河三角洲相和滨浅湖相沉积,湖盆深水区发育浊积扇相沉积。
本区下白垩统的储层分别为高孔高渗-高孔中渗储层(Ⅰ类储层)、中孔低渗储层(Ⅱ类储层)、中低孔低渗储层(Ⅲ类储层)。下白垩统储层物性和孔隙结构变化大,主要受沉积相带、深度、成岩作用影响。
Guided by the theories of sequence stratigraphy and sedimentology , the sequence stratigraphy,sedimentary facies and reservoir characteristics of lower Cretaceous in the northern Saihantala sag have been studied in detail based on the geological, well logging, seismic and testing data.
Through the combination of seismic and logging data, the formation from Aershan set to Tengger set in the study area can be divided into 3 third-order sequences(S1,S2,S3) and 6 fourth-order sequences (S1-1,S1-2,S2-1,S2-2,S3-1,S3-2). On this basis, sequence stratigraphic framework is established after the medium-term and short-term base level cycles are identified.
The types and the characteristics of sedimentary facies have been concluded which includes the alluvial fan,subaqueous fan facies, the braided river delta facies, the lacustrine facies and the turbidite fan facies, etc.
The plane distribution characteristics of sedimentary facies are as follows: the alluvial fan and braided river delta facies were deposited in the northern area; rivers-braided delta facies and shallow lake facies were distributed on Chagan slope in the western area; Subaqueous fans were developed under the uplift in the southeastern, while turbidite fan facies and deep lake facies were developed in the deep water area of the basin.
Reservoir properties and pore structures change greatly in the study area depending on the sedimentary facies types, the lithology characteristics, the buried depth and the diagenesis. three categories(ClassⅠ, ClassⅡ, ClassⅢ) of reservoir have been classified: high porosity and permeability(ClassⅠreservoir); medium porosity and permeability(ClassⅡreservoir ); low medium porosity and permeability(ClassⅢreservoir).
引文
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