CAJ | 학술논문

鄂西渝东地区中寒武统蒸发岩类盖层之下的震旦系灯影组海相岩溶地层是我国南方的重要勘探目的层。基于野外地质调查、系统薄片观察以及地球化学资料，认为这一地区存在桐湾运动两个幕次的隆升过程以及相关的古岩溶作用。在灯影组上部和中部分别形成了1个和2个洞缝带，其充填作用规律性强，以化学沉淀充填为主。上部洞缝带依次被泥晶白云石、微晶白云石以及粉晶至粗晶白云石三期充填，而中部的两个洞缝带依次被泥晶白云石、微晶白云石、纤状白云石以及粒状白云石四期充填。初步认为这些充填物发育与否主要受下渗的饱和碳酸盐流体的流动路径、流速等因素控制，残存孔隙是现今储集层的主要储集空间。灯影组古岩溶型储层应是今后这一地区油气勘探中需要关注的重点之一。
악서투동지구중한무통증발암류개층지하적진단계등영조해상암용지층시아국남방적중요감탐목적층。기우야외지질조사、계통박편관찰이급지구화학자료，인위저일지구존재동만운동량개막차적륭승과정이급상관적고암용작용。재등영조상부화중부분별형성료1개화2개동봉대，기충전작용규률성강，이화학침정충전위주。상부동봉대의차피니정백운석、미정백운석이급분정지조정백운석삼기충전，이중부적량개동봉대의차피니정백운석、미정백운석、섬상백운석이급립상백운석사기충전。초보인위저사충전물발육여부주요수하삼적포화탄산염류체적류동로경、류속등인소공제，잔존공극시현금저집층적주요저집공간。등영조고암용형저층응시금후저일지구유기감탐중수요관주적중점지일。
The thick Sinian Dengying marine dolostone karst reservoir overlaid by Middle Cambrian evaporate rock is the important target of exploration in the western Hubei-eastern Chongqing area. Two episodes of tectonic uplifting and karstification related with Tongwan movement occurred in this area, which brought in one and two fracture-cave zones respectively in the upper and middle parts of Dengying Formation. These fracture-cave zones are dominantly filled with regular chemical precipitation, including the fillings of micritic dolomite, dolomicrite, fine-coarse crystalline dolomite in the upper part and the fillings of micritic dolomite, dolomicrite, nematodolomite and granular dolomite in the middle part. It is indicated that the development of fillings is influenced by flowing paths and rates of the leakin g saturated carbonate fluid, and the residual secondary pores provide space for the present reservoirs.