CAJ | 학술논문

四川盆地寒武纪台地滩相储集体是一套重要的油气勘探目的层，准确预测其发育部位、储集性能与分布规律是其油气勘探的重要基础，其中，寒武纪不同地质历史时期古地理与构造一沉积环境的研究是储集体预测的关键。根据野外实测剖面、钻井和测井分析、地震资料，应用活动论构造一古地理思想，在沉积地质条件、区域连井地层剖面，地层厚度与沉积相等分析的基础上，综合编制了寒武纪各个时期的构造一沉积环境图件，反映了四川盆地寒武纪的古地理特征及盆地演化。四川盆地寒武纪整体呈现西高东低、北高南低的古地理格局，西部发育潮坪和滨岸等碎屑岩沉积相，中东部发育缓坡相、台地相及台地边缘浅滩相等。沉积相在时空上的响应为由早寒武世梅树村期局限台地-筇竹寺期碎屑岩台地和深水盆地-早寒武世沧浪铺期滨岸一混积台地-早寒武世龙王庙期碳酸盐岩缓坡-中寒武世陡坡寺期蒸发局限镶边台地-中晚寒武世洗象池期成熟镶边台地的演化过程。其中，筇竹寺期为巨厚的烃源岩生成期；龙王庙期和洗象池期，为碳酸盐岩储集层发育的有利时期；龙王庙期及陡坡寺期发育的蒸发岩可形成良好的盖层。
사천분지한무기태지탄상저집체시일투중요적유기감탐목적층，준학예측기발육부위、저집성능여분포규률시기유기감탐적중요기출，기중，한무기불동지질역사시기고지리여구조일침적배경적연구시저집체예측적관건。근거야외실측부면、찬정화측정분석、지진자료，응용활동론구조일고지리사상，재침적지질조건、구역련정지층부면，지층후도여침적상등분석적기출상，종합편제료한무기각개시기적구조일침적배경도건，반영료사천분지한무기적고지리특정급분지연화。사천분지한무기정체정현서고동저、북고남저적고지리격국，서부발육조평화빈안등쇄설암침적상，중동부발육완파상、태지상급태지변연천탄상등。침적상재시공상적향응위유조한무세매수촌기국한태지-공죽사기쇄설암태지화심수분지-조한무세창랑포기빈안일혼적태지-조한무세룡왕묘기탄산염암완파-중한무세두파사기증발국한양변태지-중만한무세세상지기성숙양변태지적연화과정。기중，공죽사기위거후적경원암생성기；룡왕묘기화세상지기，위탄산염암저집층발육적유리시기；룡왕묘기급두파사기발육적증발암가형성량호적개층。
The Cambrian platform bank or shore reservoir is an important petroleum exploration target in Sichuan Basin,so it is important for the oil and gas exploration to accurately predict the occurrence, reservoir performance and distribution patterns of the sedimentary facies. The study of Cambrian palaeogeography and tectonic-depositional environment is the key to reservoir prediction. Based on the field measurement of profiles,drilling and logging analysis and seismic data,with the thought of mobilistic tectonics -palaeogeography, the maps of the Cambrian tectonic-depositional environment, which can reflect the palaeogeography and basin evolution in Sichuan Basin, have been drawn by analyzing the sedimentary geology conditions, regional well profiles, stratigraphic thickness and sedimentary facies and so on. From the maps it can be seen that it was relatively higher in the west and north, lower in the east and south of Sichuan Basin during the Cambrian. The shore land and tidal flat facies were developed in the western basin ;and inner gentle slope,platform and platform marginal shoal facies were developed in the middle and eastern of study area. The response of sedimentary facies evolution in space and time is : the restricted platform in the Meishucun Age of Early Cambrian ->? clastic platform and deep basin in the Qiongzhusi Age of Early Cambrian ->> shore-mixd platform in the Canglangpu Age of Early Cambrian-^carbonate ramp in the Longwangmiao Age of the Early Cambrian ->? the evaporation and limited rimmed platform in the Douposi Age of the Middle Cambrian the mature rimmed platform in the Xixiangchi Age of the Middle-Late Cambrian. Among the above, the Qiongzhusi Formation was a thick bed of source rocks ; the Longwangmiao and Xixiangchi Formations were benefied to forming carbonate reservoirs ; gypsum rocks formed in the Longwangmiao and the Douposi Formations were good caps.