松辽盆地北部无机成因CO_2富集区带预测

PREDICTION OF ABIOGENETIC CO_2 ACCUMULATION ZONES IN NORTH SONGLIAO BASIN

为了探索无机成因CO2 成矿成藏的预测系统 ,选择松辽盆地北部为典型研究区 ,给定并探讨了CO2成矿成藏的六条预测原则和六项约束条件。其预测原则要求研究CO2 成矿成藏的构造环境、母源物质、动力因素、疏导通道、组织结构、演化序列等内容 ;其约束条件因地而异 ,需从壳内高导低速体、岩浆母源、多元动力、区域深断裂、拆离滑脱层、新构造制约等加以判别。从而区分出松辽盆地北部CO2 有利富集带 :北西西向和北北东向共轭断裂系CO2 富集带 ;讷河—五大连池断裂带CO2 富集带 ;近南北向隆起带CO2 富集带。初步认为 ,CO2 成矿成藏的构造环境离不开地幔上涌和壳内高导低速体的制约 ;母源物质离不开岩浆母源和碳酸盐岩的约束 ;动力因素是多元的 ;疏导途径与深断裂系统有关 ;气藏 (田 )结构与反转构造乃至区域拆离滑脱相关联 ;气藏 (田 )演化的最新调整与新构造运动相一致。

In order to explore the prediction system of abiogenetic CO 2 reservoir formation,the north Songliao Basin was chosen as the typical research area and six prediction principles and six restraint conditions were given out and discussed by the authors.The prediction of CO 2 reservoir formation needs to study its structural setting.original matters,dynamic factors,transport channel,organizational texture and evolution sequence,etc.Its restraint conditions are different in various areas and they may be distinguished from crust interior high-conduction-low-velocity body,original magma,multiple dynamic force,regional deep fault,decoupling slip layer and neotectonic movement,etc.,thus dividing into the following beneficial CO 2 enrichment zones in North Songliao Basin,i.e.NWWNNE conjugate fault system,Nehe-Wudalianchi fault belt and approximately north-south uplift belt.It is elementarily considered that the structural environment of CO 2 reservoir formation is restricted by upwelling mantle and crust interior hihg-conduction-low-velocity body;the original matters are controlled by original magma and carbonate rocks;the dynamic factor is multiple;the transport paths are related to the deep fault system;the gas reservoir (field) texture is associated with the overturned structure,even with the original decoupling slip;and the nearest adjustment of gas reservoir (field) evolution is consistent with the neotectonic movement.