CAJ | 학술논문

　　玛东冲断带属典型的后展式叠瓦冲断带，前三排断裂冲断作用形成于桑塔木组沉积之前，第④和第⑤排断层形成于奥陶纪末。冲断带南部位于和田古隆起岩溶斜坡，奥陶系岩溶储层充填程度低，前三排构造在海西晚期内有活化特征，有助于缝洞型储层形成。冲断带南部中寒武统膏盐层厚度比北部小，断裂活化与中下寒武统烃源岩主生烃期配合良好，油气垂向输导能力大于北部，奥陶系风化壳油气丰度大于北部。整个冲断带由于寒武系膏盐层封盖作用，滑脱断层向上输导油气的数量有限，大部分油气仍滞留在中下寒武统中，具较大勘探潜力。
　　마동충단대속전형적후전식첩와충단대，전삼배단렬충단작용형성우상탑목조침적지전，제④화제⑤배단층형성우오도기말。충단대남부위우화전고륭기암용사파，오도계암용저층충전정도저，전삼배구조재해서만기내유활화특정，유조우봉동형저층형성。충단대남부중한무통고염층후도비북부소，단렬활화여중하한무통경원암주생경기배합량호，유기수향수도능력대우북부，오도계풍화각유기봉도대우북부。정개충단대유우한무계고염층봉개작용，활탈단층향상수도유기적수량유한，대부분유기잉체류재중하한무통중，구교대감탐잠력。
Madong thrust belt is a trailing imbricate fan developed from NW to SE, the No.1,No.2 and No.3 fault were formed just before Sangtamu formation deposited. The No.4 and No.5 fault were formed after Sangtamu formation de-posited. The south part of the thrust belt were in the karst slope of Hetian paleo uplift, the Ordovician karst reservoir most non filled. The No.1,No.2 and No.3 fault in south part were reactive in late Hercynian, which could formed many fracture-cave system. The salt of middle Cambrian in the south part were thinner than that in the north part of Madong thrust belt, and the Cambrian source rock’s peak oil generation window were just in late Hercynian, oil can migrated eas-ier from source rock to the lower Ordovician formation by the reactive faults than by the non-reactive fault of north part, so there should more oil cumulated in weathered karst of Ordovician in the south part. In Madong thrust belt, capping by the salt of Middle Cambrian, only part of the hydrocarbon could migrated to upper formations, a considerable part of hy-drocarbons were still in the Middle-Lower Cambrian, which have good exploration potential.