从古生界的生烃条件看大港探区深部的勘探前景

大港探区的古生界已经获得了重大突破,在孔西地区的孔古3、孔古4井获得了以古生界为烃源岩的工业油气流。本文重点从上、下古生界烃源岩的类型、丰度、热演化程度和显微组分特征等方面,指出上古生界煤系地层具有形成煤成油的良好条件,奥陶系碳酸盐岩也是重要的生油岩,其中马家沟组和峰峰组是主要的生烃贡献者;同时,古生界具有基本独立的压力系统,表明古生界具具有良好的勘探前景。

DEEP EXPLORATION PROSPECT IN DAGANG EXPLORATION AREA BASED ON THE PALEOZOIC HYDROCARBON-GENERATING CONDITIONS

A great breakthrough has been obtained in the Paleozoic strata in the Dagang exploration area, the commercial oil flows (source rocks are the Paleozoic strata) have been got from Konggu-3 and -4 wells in Kongxi area. Based on the types. abundance. thermal evolutionary degree and maceral of the Upper and Lower Paleozoic hydrocarbon source rocks, this paper points out that the Upper Paleozoic coal measures have good conditions to from the coal-derived oil, and the Ordovician carbonates are also important oil source rocks, in the vertical direction, the Majiagou and Fengfeng formations are the major hydrocarbon contributors; meanwhile, the Paleozoic strata have a unique pressure system. it indicates that the Paleozoic Erathem has a good exploration prospect.