CAJ | 학술논문

　　通过野外剖面、钻井剖面的精细对比，结合宽带约束的地震资料反演，对四川盆地东南地区中、下寒武统膏岩盖层的分布特征进行了研究，并在四川盆地及周缘构造演化的基础之上对中、下寒武统膏岩盖层的封盖有效性进行了探讨。四川盆地东南地区中、下寒武统膏岩连片分布，呈北东向展布，发育两个膏岩厚度中心，膏岩展布和圈闭分布完全匹配。在加里东期和印支期，四川盆地东南地区中、下寒武统膏岩层未遭受破坏，能够有效封盖震旦系古油（气）藏；在燕山期和喜马拉雅期，则膏岩层遭受破坏，失去了对丁山－林滩场地区古油（气）藏的封盖作用。同时指出，七跃山断裂以西地区膏岩层在后期构造运动中未被完全破坏，能够对盐下油气藏起到封盖作用，是川东南地区寒武系盐下的有利勘探区带。
　　통과야외부면、찬정부면적정세대비，결합관대약속적지진자료반연，대사천분지동남지구중、하한무통고암개층적분포특정진행료연구，병재사천분지급주연구조연화적기출지상대중、하한무통고암개층적봉개유효성진행료탐토。사천분지동남지구중、하한무통고암련편분포，정북동향전포，발육량개고암후도중심，고암전포화권폐분포완전필배。재가리동기화인지기，사천분지동남지구중、하한무통고암층미조수파배，능구유효봉개진단계고유（기）장；재연산기화희마랍아기，칙고암층조수파배，실거료대정산－림탄장지구고유（기）장적봉개작용。동시지출，칠약산단렬이서지구고암층재후기구조운동중미피완전파배，능구대염하유기장기도봉개작용，시천동남지구한무계염하적유리감탐구대。
Based on correlation of outcrop section with wellbore pofile and in combination with seismic inversion under the constraint of broadband , this paper analyzed the distribution of the Middle-Lower Cambrian evaporite cap rocks in the southeast of Sichuan Basin .It also discussed the sealing effectiveness of the evaporite cap rocks based on study of the tec -tonic evolution of Sichuan Basin and its periphery .In the southeastern Sichuan Basin ,the Middle-lower Cambrian evapo-rites are widely distributed in northeast direction with two thickness centers ,and the distribution of evaporites coincides perfectly with the trap distribution .During the Caledonian and Indosinian period , sealing capacity of the Middle-Lower Cambrian evaporites was not destroyed ,so they could serve as effective seals for the Sinian ancient oil ( gas) accumula-tions.Whereas,their sealing capacity was lost during the Yanshan and Himalayan period ,thus the ancient oil (gas) accu-mulations in the Dingshan-Lingtanchang area were not effectively preserved .As the Middle-Lower Cambrian evaporite cap rocks to the west of Qiyueshan fault were not destroyed completely post-Indosinian movement ,they could effectively seal the presalt Sinian oil ( gas) accumulation , thus this area is favorable for petroleum exploration in the pre-salt strata in southeastern Sichuan Basin .