CAJ | 학술논문

沉积环境影响着烃源岩的发育情况，因而研究侏罗系杨叶组沉积时的古环境对塔东南坳陷的勘探开发及有利区块的优选有着重要意义。本文根据区内已有钻井的岩心观察结果、岩电组合特征、分析化验资料和野外露头及古生物特征，对区内侏罗系杨叶组的沉积相特征及古环境进行了分析研究，指出了该区沉积相主要发育有辫状河三角洲沉积和湖泊沉积。其沉积环境为陆相淡水环境，具有较强的还原性；古气候为温暖半潮湿亚热带气候。提出该区优质烃源岩形成的最有利相带的浅湖-半深湖湖湾环境。通过对沉积相和古环境的研究，总结了沉积相平面展布特征和四大控制因素。
침적배경영향착경원암적발육정황，인이연구주라계양협조침적시적고배경대탑동남요함적감탐개발급유리구괴적우선유착중요의의。본문근거구내이유찬정적암심관찰결과、암전조합특정、분석화험자료화야외로두급고생물특정，대구내주라계양협조적침적상특정급고배경진행료분석연구，지출료해구침적상주요발육유변상하삼각주침적화호박침적。기침적배경위륙상담수배경，구유교강적환원성；고기후위온난반조습아열대기후。제출해구우질경원암형성적최유리상대적천호-반심호호만배경。통과대침적상화고배경적연구，총결료침적상평면전포특정화사대공제인소。
Depositional environment is directly related to the development of source rock, and hence the study of the depositional environment has important significance for optimizing the favorable exploration blocks. The authors studied sedimentary facies characteristics and palaeoenvironment of Jurassic Yangye Formation on the basis of core observation, lithologic-electric logging features, test data, outcrop and palaeontological features. It is pointed out that the study area has developed two types of sedimentary facies:braided delta river facies and lake facies. The palaeoenvironment was a terrestrial freshwater environment characterized by strong reducibility. The paleoclimate was in a warm-humid climate background. A viewpoint confirmed by the field investigation is given, arguing that the optimum sedimentary facies were the shallow to half-deep lakes. Based on investigating the source rock sedimentary facies and palaeoenvironment, the authors have summarized the flat facies characteristics and the four main controlling factors.