塔里木盆地塔北露头区的古岩溶发育模式

目前塔里木盆地海相碳酸盐岩的油气勘探已进入高峰期,为弥补钻井岩心资料不足,进一步认识井下岩溶发育规律及发育模式特征,开展塔北露头区奥陶系风化壳古岩溶缝洞系统发育特征及发育模式研究。研究表明,岩溶发育主要受控于岩性因素和不整合面,主要发育层位为一间房组地层;主要岩溶作用期为吐木休克组/一间房组沉积间断岩溶期。为井下岩溶缝洞系统的认识及岩溶地质模型的建立提供了重要理论依据。

PALAEOKARST MODELING FOR OUTCROPS IN TABEI,TRAIM BASIN

Oil and gas exploration and production from the marine carbonate reservoirs have entered a blooming period in theTarim Basin. Due to lack of enough drilling core data, the study of palaeokarst reservoirs is faced with difficulties. As an alternative, the only way is to carry out the studies on the Ordovician weathering crust and the karst cave system and their evolution through outcrops, which are well developed in the Tabei area. Our research shows that the development of palaeokarst is main-ly controlled by lithology and the unconformities, mainly in the Yijianfang Formation. The main karstification period is in conjunction with the time when the hiatus between the Tumuxiuke group and the Yijianfang group was formed. The results are significant for understanding and modeling of the underground cave system.