摘要
发育在压性、压扭性盆地中的同沉积逆断层上盘地层比下盘地层相应地要薄。上盘可缺失某些层段或一直未接受沉积,上盘发育的不对称背斜可为同生、部分同生或后生;下盘地层有时呈楔状向断层处加厚,凹陷内的断层两侧岩性差异小,盆缘或凹陷边界断层岩性差异明显。断面形态有铲形和平直形,前者主要与逆冲推覆有关,后者主要受基底断块控制。断层活动方式有连续和间歇性活动两种。断层发育阶段分为同生冲断期、褶皱发育期和消亡期。 同沉积逆断层具有良好的聚油条件。圈闭形式主要有上盘背斜、断层遮挡、浅层压实背科、基岩潜山及地层尖灭等,并可叠合连片。聚油方式以“新生古储”为主,并有“古生新储”;油气主要通过接触式或顺断层运移。
The characteristics of synsedimentary reverse faults in compressive and com-pressive-shear basins are as follows: the deposits at hangwall are thinner than that at foot-wall, some layers may be absent or no any deposits on hangwall. The asymmetrical folds inhangwall are synsedimentary or postsedimentary. The deposit facies on the bothsides of thefault change a little in depression, but can be very different across the fault in the margin ofdepression. The fault surfaces are listric or plannar,which relate to thrusting and the activityof basement faulted-block respectively. The developing patterns of synsedimental reversefaults are continuation or interruption. The developing process can be divided into threestages,i. e. synsedimentary faulting,folding, and dying out of faulting.
