DISTRIBUTION CHARACTERISTICS OF UPPER PALEOZOIC DEEP STRATA SERIES IN SONGLIAO BASIN: Evidence from Comprehensive Geophysical Data
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摘要:
松辽盆地及外围石炭纪—二叠纪地层分布广、厚度大，油气资源前景备受关注，但松辽盆地深部的石炭－二叠系尚待系统而精细的研究，目前得到的相关深层系信息尚不能清晰刻画上古生界地层的残留特征. 基于盆地内相关二维深反射地震剖面、重力资料，通过强约束“剥皮”技术、地震资料精细解释和测井数据多信息融合反演等方法，获得了相关目的层系分布与产出特征，以及经历多期次构造叠加石炭－二叠系的保存状况. 研究表明，上古生界地层可大致划分为北带、中带和南带；现今的石炭－二叠系仍然保留了受古亚洲洋板块影响形成的东西向隆拗褶皱构造；中生代时期盆地的南北部受太平洋板块的影响存在差异；盆地断陷发育区石炭－二叠系埋藏较深，地层较厚，盖层厚度大，保存较好.
Abstract:As the Carboniferous-Permian strata in Songliao Basin and its periphery are widely distributed with large thickness, the prospect of oil-gas resources is of great concern, yet the residual characteristics of the Upper Paleozoic strata cannot be clearly described by the relevant information of deep strata series obtained currently, thus the Carboniferous-Permian strata in the deep part of Songliao Basin remains to be studied systematically and carefully. Based on 2D deep reflection seismic section and gravity data of the basin, the distribution and occurrence characteristics of target strata series and preservation status of Carboniferous-Permian strata superposed by multi-stage structures are obtained by means of strong constrain stripping method, fine interpretation of seismic data and multi-information fusion inversion of logging data. The results indicate that the Upper Paleozoic strata can be roughly divided into north, middle and south zones. The present Carboniferous-Permian strata still retains the E-W uplift and depression fold structure formed under the influence of Paleo-Asian Ocean plate. The influence of Pacific plate is different in the north and south of basin during the Mesozoic. The Carboniferous-Permian in the fault depression of basin is characterized by deep burial, thick strata, thick cap rock and good preservation.
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表 1 研究区物性界面关系表
Table 1. Physical property interfaces in the study area
岩石地层 电性层 磁性 密度界面 Q+N 中低阻 无磁 K2 低阻 弱磁 第一密度界面 K1 中低阻+中高阻 第二密度界面 J3+J2 高阻 中强 J1 低阻 弱磁 第三密度界面 P3 高阻+低阻 弱磁 P2 高阻 中强 P1 低阻 弱磁 第四密度界面 C2-3 高阻 C1 低阻 C之前 高阻 花岗岩 高阻 弱磁 密度2.53~2.60 花岗闪长岩 密度2.65~2.72 
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