湘西北区晚震旦世至奥陶纪沉积环境分析

为配合湘鄂拗陷区寻找油、气,进一步探索区内海相碳酸盐岩的找油远景,填补该区沉积岩相方面的空白,开展了湘西北区沉积岩相的初步研究。震旦系上统至奥陶系地层发育齐全、构造简单、岩浆活动极微弱,其研究层位地层厚度大于3581.63米,具有较好的生油岩层,是湘鄂拗陷区下古生界找油、气的主要目的层系。 

SEDIMENTARY ENVIRONMENT ANALYSIS FOR LATE SINIAN TO ORDOVICIAN IN NOTHWESTERN OF HUNAN PROVINCE

This paper describes the main types of rock, colour, texture composition, structure characteristics,facies-indicaotors and terrestrial minerals, organism complex and their ecology,along with relative depths of water body,hydrod-namic condition, energy level, wave base, palaeogeomorphological featurcsy of sea bed, and geographical location in Nothwestern of Hunan province Correspondingly, the sedimentary environments of the strata from late Sinian to Ordovician are divided into eight types.