辽河断陷内郯庐断裂的位置及对油区的控制

辽河油田经过十余年勘探,取得了大量的深井和地震资料,经分析研究发现区内前第三系基底在东西方向上分为三块,中间存在两条断裂。本文在论述三块基底差异的基础上,提出郯庐断裂通过辽河断陷内的位置及其平移的性质。东面一条基底断裂是主干断裂,西面的是并列断裂。由于它们的存在及其活动的差异,对下第三系的油区有较明显的控制,因此造成了辽河断陷的东西凹陷的油气富集程度的差异。

LOCATION OF FAULTS AT TANLU IN THE LIAOHE DEPRESSION AND THEIR CONTROL OVER OIL ACCUMULATIONS OF THE REGION

Analysis of data from deep well drilling and seismic survey carried out in the Liaohe oil field during the last decade indicates that the pre-Tertiary basement of the region is divided into three blocks running in an EW direction with two faults lying between. On the basis of the differences between the three basement blocks, the location of these faults running through the Liaohe fault-depression is proposed as well as the character of phorogenesis. According to the author, the fault on the east is the main fault, with the one on the west parallel to it. The differences of their occurrence and activities that evidently had played a controlling role in the oil region during Paleogene resulted in the difference of oil accumulations in the eastern and western parts of the Liaohe fault depression.