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湘中地区在印支运动以前是一个地台的一部分,中新生代强烈活化而成为地洼区。海相碳酸盐岩组成本区上古生界的主体,其有机碳丰度数据符合伽马分布,平均值较低。正常地温场和埋藏时间在印支运动以前是控制有机质演化进程的主导因素,但从印支运动以来,构造变动和岩浆活动对这一进程的影响十分明显。因为上古生界有机质的演化水平很高,地质工作的重点应该摆在气藏的普查勘探方面。近三年来,由于油气资源定量预测工作的需要,我们以中泥盆统棋梓桥组至下石炭统石磴子组的碳酸盐岩为重点,对湘中地区的上古生界(图1)进行了野外调查和室内研究。本文试图对控制本区上古生界碳酸盐岩油气生成过程的内因和外因,进行初步分析。
The area of Central Hunan Province was part of a platform before the Indo-Chinese Movement. The Mesozoic and Cenozoic regions were strongly activated and became the depression area. Marine carbonates constitute the main part of the Upper Paleozoic in this region, and their organic carbon abundance data are in accordance with the gamma distribution with a lower average value. The normal temperature field and burial time before the Indosinian movement was the dominant factor in controlling the evolution of organic matter. However, since the Indo-Chinese Movement, tectonic movements and magmatic activities had an obvious effect on this process. Because of the high evolution of organic matter in the Upper Paleozoic, the focus of geological work should be on census exploration of gas reservoirs. In the past three years, due to the need of quantitative prediction of oil and gas resources, we focused on the carbonate rocks of the Zhizziqiao Formation of the Middle Devonian to the Shijiazui Formation of the Lower Carboniferous, ) Conducted a field survey and an in-house study. This paper attempts to control the upper Paleozoic carbonate rocks in the area of oil and gas generation process of internal and external factors, a preliminary analysis.