摘要
依据断裂规模及其控制作用 ,划分出一级控盆、二级分区、三级控带、四级控圈和五级小断裂 ,各级断裂有机组合 ,构成四大断裂系统 :赛什腾断裂系统、大红沟断裂系统、昆特依断裂系统和中部断裂系统。大断裂控制了柴北缘深浅层的构造格局 ,形成了南北成带、东西分块、洼隆相间、上下分层构造格架。中、下侏罗统地层的展布明显受侏罗纪基底大断裂的控制。柴北缘发育七种类型的构造发育模式 :断裂反转—基底逆冲—反冲断滑构造发育模式 ;地层反转—冲起—断滑褶皱叠加模式 ;断层反转 -冲起滑褶皱叠加构造模式 ;断层反转—顺冲断滑褶皱叠加模式 ;断层反转—基底逆冲—断滑褶皱叠加模式 ;潜伏断展背斜发育模式 ;断层反转—反冲断滑褶皱叠加模式。断裂是控制本区油气分布的主要控制因素。基底大断裂控制着烃源岩的展布 ;油气藏的重要聚集空间 -构造圈闭的形成与分布也受断裂控制 。
According to the magnitudes of faults and their control effects, the faults may be divided into grade 1 basin-controlled faults. grade 2 area-controlled faults, grade 3 belt-controlled faults, grade 4 trap-controlled faults and grade 5 small faults. The organic combinations of various grades of faults form 4 large fault systems, i. e. Saishiteng fault system, Dahonggou fault system, Kunteyi fault system and Central fault system. Tectonic pattern of the deep and shallow strata in the northern fringe of Chaidamu Basin was controlled by the large faults, such a tectonic framework as north-south zoning, west-east blocking, depressions alternating with uplifts and layering from top to bottom, etc., being formed at last. The distribution of the Middle and Lower Jurassic is obviously controlled by Jurassic basement faults. 7 structural development modes have been found out in the northern fringe of Chaidamu Basin, i. e. fault overturning-basement thrusting -reverse thrusting fault sliding mode; strata overturning - thrusting up - superposed fault sliding fold mode; fault overturning -thrusting up - superposed fault sliding fold mode; fault overturning-superposed consequent thrusting fault sliding fold mode; fault overturning - basement thrusting - superposed fault sliding fold mode; buried faulted anticline mode; and fault overturning-superposed reverse thrusting fault sliding fold mode. Fault is the principal factor of controlling the distribution of oil and gas in this region. The distribution of hydrocarbon source rocks is controlled by the basement faults.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第3期22-26,共5页
Natural Gas Industry
基金
中国博士后科学基金资助
