辽河坳陷曙北地区新生代层序地层及沉积体系发育特征
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摘要
曙北地区是辽河坳陷西部凹陷的一个次级单元,是在太古界和中、晚元古界基底上发育起来的新生代裂谷盆地,新生界自下而上发育的地层为古近系房身泡组、沙河街组、东营组和新近系馆陶组,并覆盖第四系的沉积。通过地震、测井和地质资料的综合研究及时频分析技术的应用,本区新生代裂谷盆地沉积可划分为1个大陆裂谷巨层序、1个大陆裂谷后热沉降超层序和1个同裂谷沉降超层序、4个层序和14个体系域,并存在I型层序和Ⅱ型层序。通过研究提出了断陷湖盆缓坡层序地层模式,揭示了不同的体系域中沉积体系的发育具有的不同特征。在两种不同类型层序的TST和HST之间,常发育大套的页岩,构成主要的生油层和盖层,各体系域的边缘场所构成良好的储层。本区层序地层的划分对于优质储层的寻找和油气富集规律的研究具有重要意义。
The Shubei area is a secondary unit of the West subbasin of the Liaohe basin and a Cenozoic rift basin that developed on the Archean and Meso- and Neoproterozoic basements.The Cenozoic strata may be divided in ascending order into the Paleogene Fangshenpao Formation,Shahejie Formation and Dongying Formation and the Neogene Guantao Formation,overlain by Quaternary deposits.By an integrated study of the seismic,logging and geological data and application of the time-frequency analytical technique,the Cenozoic rift deposits may be divided into 1 continental rift megasequence,1 continental postrift heat-sink supersequence,1 synrift sink supersequence,4 sequences and 14 systems tracts,and there exist type I sequences and type II sequences.A sequence stratigraphic model of the gentle slope in a down-faulted lake basin has been constructed.The authors propose that the developments of sedimentary systems in different systems tracts have different characteristics.Between the transgressive systems tract (TST) and highstand systems tract (HST) there usually occurs a large suite of shale,which forms the main source rock and sealing rock,and the reservoir rock forms on the margins of various systems tracts.The sequence stratigraphic division in the area has great significance for the search for good-quality reservoirs and the study of the characteristics of petroleum concentration.
The Shubei area is a secondary unit of the West subbasin of the Liaohe basin and a Cenozoic rift basin that developed on the Archean and Meso- and Neoproterozoic basements.The Cenozoic strata may be divided in ascending order into the Paleogene Fangshenpao Formation,Shahejie Formation and Dongying Formation and the Neogene Guantao Formation,overlain by Quaternary deposits.By an integrated study of the seismic,logging and geological data and application of the time-frequency analytical technique,the Cenozoic rift deposits may be divided into 1 continental rift megasequence,1 continental postrift heat-sink supersequence,1 synrift sink supersequence,4 sequences and 14 systems tracts,and there exist type I sequences and type II sequences.A sequence stratigraphic model of the gentle slope in a down-faulted lake basin has been constructed.The authors propose that the developments of sedimentary systems in different systems tracts have different characteristics.Between the transgressive systems tract (TST) and highstand systems tract (HST) there usually occurs a large suite of shale,which forms the main source rock and sealing rock,and the reservoir rock forms on the margins of various systems tracts.The sequence stratigraphic division in the area has great significance for the search for good-quality reservoirs and the study of the characteristics of petroleum concentration.
引文
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