高精度层序地层学在滩坝砂体勘探中的应用——以惠民凹陷沙四上亚段为例
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摘要
山东济阳坳陷的惠民凹陷目前以滩坝相的勘探为主。惠民凹陷内部各个区域沉积环境差异较大,研究区沙四上亚段地层深度大,而且沉积砂体分布不连续,仅仅利用地震剖面来研究识别滩坝砂体存在困难。在滩坝相的勘探中,首先利用高精度层序地层学方法建立高精度层序地层格架,再以层序地层格架为单元,结合录井、测井和地震资料识别滩坝相。另外针对研究区的特点,采用"分区选取重点井,相邻井对比"的方法,应用高精度层序地层学,将研究层位作为一个三级层序进行层序地层划分,结合测井和岩心资料的综合分析,有效的将体系域界面识别出来,建立了全区的高精度层序地层格架。在格架内对滩坝砂体进行研究识别。
The oil exploration in the east China came into the phrase that objects were subtle reservoirs.The present objects of Huimin Depression were sand-bar sedimentary facies.The depositional environments were different in every part of Huimin Depression,the depth of upper member of Es4 was high,and the distribution of sandstone was not continuous,so the identification of sand-bar bodies in the seismic sections was hard.The sequence stratigraphical framework was established firstly,the sequence stratigraphical framework was used as the unit ,in combination with well-logging and seismic data,the sand -bar was identified.In addition,in consideration of the characters of the area,the method for choosing the key wells and comparing with the neighbor wells was used.The theory of high precision sequence stratigraphy is used,by which the studied horizon is identified as 3rd grade sequence for sequence stratigraphical identification ,in combination with logging and cores data for subdividing the upper-Shahejie fourth Formation into three tracts,the domain surface is identified by establishing the high-precision stratigraphical framework for effectively identifying the sand-bars.
The oil exploration in the east China came into the phrase that objects were subtle reservoirs.The present objects of Huimin Depression were sand-bar sedimentary facies.The depositional environments were different in every part of Huimin Depression,the depth of upper member of Es4 was high,and the distribution of sandstone was not continuous,so the identification of sand-bar bodies in the seismic sections was hard.The sequence stratigraphical framework was established firstly,the sequence stratigraphical framework was used as the unit ,in combination with well-logging and seismic data,the sand -bar was identified.In addition,in consideration of the characters of the area,the method for choosing the key wells and comparing with the neighbor wells was used.The theory of high precision sequence stratigraphy is used,by which the studied horizon is identified as 3rd grade sequence for sequence stratigraphical identification ,in combination with logging and cores data for subdividing the upper-Shahejie fourth Formation into three tracts,the domain surface is identified by establishing the high-precision stratigraphical framework for effectively identifying the sand-bars.
引文
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