CAJ | 학술논문

东吴运动造成茅口组灰岩暴露地表并经历了表生风化作用。钻井揭示，气藏储层段与古岩溶所处的位置及强度密切相关，古地貌是控制古岩溶发育与分布的主要因素。针对钻井较少且分布不均、勘探程度不高的川东南地区，将钻井与地震紧密结合，分别运用残余厚度法与印模法对茅口组岩溶古地貌进行恢复，结果对比发现，这2种方法恢复出来的古地貌趋势基本一致。结合研究区的地质特征和实际资料，认为印模法可信度更高。在古水系特征分析的基础上，结合古地质图和钻井资料，把研究区划分为岩溶高地、岩溶斜坡和岩溶盆地，其中岩溶斜坡又可分为岩溶陡坡与岩溶缓坡。研究区西南岩溶高地与蜀南岩溶高地为同一岩溶高地，呈北西-南东向展布，且相对蜀南地区隆起幅度更高。在岩溶斜坡区，地下水以径流为主，溶蚀孔洞发育，是岩溶勘探开发的有利地区。
동오운동조성모구조회암폭로지표병경력료표생풍화작용。찬정게시，기장저층단여고암용소처적위치급강도밀절상관，고지모시공제고암용발육여분포적주요인소。침대찬정교소차분포불균、감탐정도불고적천동남지구，장찬정여지진긴밀결합，분별운용잔여후도법여인모법대모구조암용고지모진행회복，결과대비발현，저2충방법회복출래적고지모추세기본일치。결합연구구적지질특정화실제자료，인위인모법가신도경고。재고수계특정분석적기출상，결합고지질도화찬정자료，파연구구화분위암용고지、암용사파화암용분지，기중암용사파우가분위암용두파여암용완파。연구구서남암용고지여촉남암용고지위동일암용고지，정북서-남동향전포，차상대촉남지구륭기폭도경고。재암용사파구，지하수이경류위주，용식공동발육，시암용감탐개발적유리지구。
The Dongwu Movement caused the exposure of Maokou limestone on the earth's surface and made it experience the su-pergene weathering process. Drilling reveals that the gas reservoir is closely related to the location and intensity of ancient landforms. Palaeogeomorphology is the main factor that affects the development and distribution of ancient karst. Southeastern Sichuan basin has had less drilling and is unevenly distributed, with insufficient exploration. Combining drilling with seismic survey, the authors exqui-sitely restored ancient karst landform of Maokou by applying the impression method and the residual method. A comparison of these two methods show that both methods can recover the same basic trend palaeogeomorphology. According to the geological features and practical data of the study area, the authors hold that the impression method has higher reliability. Based on an analysis of the an-cient water system, the authors divided the study area into karst highland, karst slope and karst basin by combining it with paleogeo-logic map and drilling. The NW-SE trending karst highland in the southwest of the study area has the same highland as the karst highland in Shunan area, but it is higher than Shunan area. The groundwater runoff and corrosion holes of the karst slope area make it a favorable area for karst exploration.