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饶阳凹陷蠡县斜坡古近系层序地层学研究与岩性圈闭预测
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摘要
以层序地层学和沉积学理论为指导,通过岩心、钻井、测井和地震等资料的综合分析,将蠡县斜坡古近系划分为3个二级层序、10个三级级层。在宏观层序地层格架的控制下,针对重点层段沙二段(SQVI)和沙一段(SQVII),开展了高分辨率层序地层学分析,以测井资料为基础,利用小波分析等方法,将其中低位域、湖侵域和高位域三种不同类型的6个体系域划分为11个准层序组。在关键取心井相分析的基础上,结合测井曲线特征、分析化验资料等,在SQVI~SQVII高分辨率层序地层格架内主要识别出辫状河三角洲和湖泊两种相类型,进一步细分为5种亚相、12种微相。综合砂层厚度等值线图和砂岩百分含量等值线图等单因素图件,分析认为:SQVI和SQVII低位域,在斜坡外带局部地区发育辫状河三角洲平原亚相,而辫状河三角洲前缘亚相作为沉积主体广布于斜坡中带及斜坡低部位;SQVII湖侵域基本为湖泊覆盖,滩坝相发育,只在大百尺一带发育小型辫状河三角洲前缘,并且该时期形成了全区最为重要的一套富氢烃源岩;高位域基本继承了湖侵域的沉积特点,只在南部地区有辫状河三角洲前缘沉积,北部地区为湖泊覆盖。斜坡中带和频临洼槽低部位的低孔中渗前缘席状砂储集体及中孔中高渗滩坝储集体尖灭于或被暗色泥岩包裹,具备良好的生储盖组合条件,是最有利于形成岩性上倾尖灭和透镜体等岩性油藏的区带。
With the theoretical basis of sequence stratigraphy and sedimentology, through the comprehensive analysis of the data related to cores, drilling, logging and seismic, the Paleogene in Lixian Slope of Raoyang Sag can be divided into three second-order sequences and ten third-order sequences. Under the control of macro-sequence stratigraphic framework, with the principle of high-resolution sequence stratigrphy, the Member 2 of Shahejie Formation(SQVI) and the Member 1 of Shahejie Formation(SQVII) can be divided into 6 system tracts with 3 types: lowstand system tract, extension system tract and highstand system tract, and on this basis, these 6 system tracts can be further divided into 11 parasequence sets, based on the logging data by the wavelet analysis. On the base of the sedimentary facies analysis of single well and combining with the characteristics of logging curves and the testing results, braided river delta and lacustrine are identified in the isochronal framework of sequence stratigraphy of SQVI~SQVII. They can be subdivided into 5 types of subfacies and 12 types of microfacies. Through the analysis of single factor maps, such as the sand thickness contour map and percentage of sandstone contour map, the braided river delta plain distributes on the outer belt of the slope,but along the middle belt of the slope the braided river delta-front is widely developed during SQVI and the lowstand system tract of SQVII, as the main part of the sedimentary. While the extension system tract of SQVII is covered by lacustrine , and beach bar and carbonate bank-dam distribute along the shoreline, only in the area of Da Baichi a small delta-front is developed. Meanwhile, during this period, the most important set of hydrogen-rich hydrocarbon source rocks were formed. The highstand system tract of SQVII basically inherited the characteristics of the previous phase, only in the southern region braided delta front develops and the northern region was covered by lakes. The braided river delta-front sandbodies which are low-porosity and medium-permeability and the beach bar and carbonate bank-dam which are medium-porosity and medium-permeability or high-permeability in the middle and inner belts are pinch-out in or wrapped by the dark mudstone. These areas have a good source-reservoir-cap combination, and are the favorable exploration areas of sandstone updip pinch-out reservoirs and lens reservoir.
引文
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