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本文试图从找油的角度对华北北部下古生界沉积相发育特征进行初步探讨。文中根据本区沉积发育特点进行了沉积相的划分,并利用有20条露头及录井剖面组成的能控制全区的五条沉积相对比大剖面,进行了区域沉积相对比。以此对下古生界每组段的沉积相发育特征进行了初步的讨论,从而获得了以下几点认识:(1)本区下古生界纵向上可划分为三个沉积发育阶段和两大海浸旋回;(2)下古生界各组段沉积相的横向递变具有一定的规律性,反映出古地形发育具有一定的继承性;(3)下古生代的海浸来自南北两个方向,但不同时期各有差异;(4)下古生代的古海洋具有内陆海的性质;(5) 局限海和广海是生油有利相带。下古生界生油有利相带的发育第二海浸旋回优于第一旋回,在横向上以北部为最佳。
This paper attempts to find the oil from the perspective of the North Paleozoic sedimentary facies characteristics of North China preliminary study. According to the characteristics of sedimentary development in this area, the division of sedimentary facies has been carried out and the relative deposition of five sedimentary facies in the whole area has been controlled by using 20 outcrops and logging sections. Based on this, the sedimentary facies development characteristics of each group of Lower Paleozoic are discussed preliminarily, and the following points are obtained: (1) The Lower Paleozoic in this area can be divided into three sedimentary development stages and two (2) Lateral Paleozoic sedimentary facies in each section of the horizontal gradient has a certain regularity, reflecting the development of the ancient terrain has a certain inheritance; (3) the Paleozoic sea immersion from both north and south directions (4) the paleo-Paleozoic paleo-ocean has the properties of inland sea; (5) the confined sea and Guanghai are favorable facies belts of oil generation. Lower Paleozoic oil-bearing favorable facies development Second sea-immersion cycle is superior to the first cycle, the best in the horizontal to the north.