【摘要】 以往对依—舒地堑北段的石油地质评价中没有对整个地堑的构造格局进行系统研究,全区没有统一的地震地质层位划分方案,地震资料品质较差,影响构造研究和沉积研究,区带评价也不够深入,因此没有明确的勘探方向。文中以现有地震资料为基础,充分结合钻井、重、磁、电及周边地质等资料,开展以区域构造研究为核心的综合评价工作,并和伊通地堑进行类比,同时对现有的地震资料品质进行评价,取得了以下认识:①依—舒地堑在古生界变质岩基底之上,共充填了4套沉积序列,即中生界白垩系、新生界下第三系、上第三系及第四系,其中下第三系和白垩系是主要勘探目的层系;②地堑整体表现为东西分带、南北分块的构造格架,每个区块都有不同的构造—岩相组合方式,并以南北分块为主要构造特征;③汤原断陷的东发、东兴向斜为最有利的勘探区块(Ⅰ类),方正断陷的柞树岗向斜为最有利勘探区带(Ⅰ类)。在以上认识基础上通过对全盆地构造工业制图和方正三维、汤原连片三维构造解释,提出了6口钻探井位建议,5口被采纳,其中3口完钻。更多还原

【Abstract】 The structural feature of total graben was not carried out systematically in former petroleum-geologic evaluation of northern part of Yi-Shu graben,there was not uniform division plan of seismic and geologic horizons and the quality of seismic data was poorer,which affected the study of structure and sedimentation,meanwhile,the zone evaluation was not enough deep,so there is not clear direction of exploration.Based on available seismic data and fully combining with drilling,gravity,magnetic,electric and surrounding geologic data,the paper implemented the integrative evaluation work taking regional structural study as kernel and compared with Yitong graben,and carried out evaluation of the quality of seismic data at the same time,achieving following knowledge: ①Yi-Shu graben is upon the Paleozoic metamorphics basement and is filled up with four sets of sedimentary sequences: Mesozoic Cretaceous,Cenozoic Tertiary,Neogene and Quaternary,among which the Cretaceous and Tertiary are major prospecting objective strata;②the graben is characteristics of zoning in E-W direction and blocking in S-N direction structurally,each zone and block has different structure-lithology composition pattern,and blocking in S-N direction is main structural feature;③the Dongfa and Dongxing inclines in Tangyuan fault depression are favorable prospecting zones(category I) and Zheshugang incline in Fangzheng fault depression is favorable prospecting zone(category I).Based on above knowledge and structural industrial mapping in whole basin as well as Fangzheng and Tangyuan 3-D structural block-jointing together interpretation,the suggestion of 6 drilling wells was presented and five of which were accepted and 3 were drilled.更多还原