冀北宽城地区中上元古界、寒武系有机质热演化特征及油源探讨

ON PETROLEUM SOURCE AND MATURATION CHARACTERISTICS OF THE ORGANIC MATTER OF CAMBRIAN AND MIDDLE-UPPER PROTEROZOIC IN KUANCHENG REGION OF NORTHERN HEBEI PROVINCE

刘宝泉 方杰

Liu Baoquan Fang Jie

华北石油勘探开发研究院

North China Research Institute of Petroleum Exploration and Development, Ministry of Petroleum Industry

华北燕辽沉降带中上元古界和寒武系较为发育,地层总厚近万米,其中油苗也较为普遍.本文对冀北宽城地区所出露的地层剖面,在大量的样品实验测试基础上,对中上元古界和寒武系的生油条件、地化特征及其油源作了初步探讨,认为Zjt、Zcg、Zjh、ZqX的深灰色灰岩和页岩为较好油气源岩,区内油气显示主要来自铁岭组灰岩和洪水庄组页岩;中上元古界中部的蓟县系有机质热演化较低,仍处于生油阶段,而其上覆的青白口系、寒武系和下伏的长城系有机质热演化较高,巳进入过熟阶段早期.

The Middle-Upper Proterozoic and Cambrian sediments are well developed in Yanliao Subsidence Belt of North China and the thickness of the sedimentary strata is almost 10 Km in which oil/gas shows are widespreaded. Based on the outcropped stratigraphic profile of the area, the oil generation conditions, geochemical characteristics, and oil source of the Middle-Upper Proterozoic and Cambrian systems are studied using many analytical data. It is suggested that the dark grey-limestones and shales of Zit, Zih, Zcg, Zcch and Zqx are the good source rooks. The oil/gas shows in the area are mainly derived from the limestone of the Tielng Formation and the shales of the Hongshuizhuang Formation. The maturity of the organic matter in Jixian System of Middle-Upper Proterozoic is rather low and still remains in the oil generation stage,while those of the overlying and underlying Qing-beikou, Cambrian systems and Changcheng System have already entered the overmature stage.

https://doi.org/10.11781/sysydz198901016