胜北洼陷胜北构造带白垩系连木沁组沉积体系分布与岩性油气藏勘探

吐哈盆地胜北洼陷胜北构造带白垩系连木沁组属于典型的北物源扇三角洲前缘沉积体系,其砂体埋藏深度较浅,储层物性较好,向北上倾尖灭型岩性圈闭发育。根据胜北洼中隆良好的古构造背景,结合胜北3、4号南北向平移断层沟通中、下侏罗统水西沟群煤系地层和中侏罗统七克台组湖相泥岩烃源岩系等情况,认为胜北洼陷白垩系是浅层次生岩性油气藏勘探的有利地区。

SEDIMENTARY SYSTEM DISTRIBUTION AND SUBTLE TRAPS EXPLORATION OF LIANMUQIN FORMATION CRETACEOUS,SHENGBEI STRUCTURE ZONE,SHENGBEI SAG

Lianmuqin Formation of Cretaceous, Shengbei structure zone of Shengbei Sag, Turban-Harmy basin, belongs to typical fan-deltaic front sedimentary system of north sediment source. The sandstone bodies of this sedimentary system are buried in shallow position and in good quality of porosity and perme ability. Shengbei structure zone and its south flank are the main position for sandstone and available for the north pinch out subtle traps development. Combined the background of upheaval in sag and cling to the strike-shift faults of Shengbei F3 and F4, which join the hydrocarbon source rocks of coal-bearing series of Shuixigou group, lower-middle Jurassic and lacustrine mudstone of Qiketai formation of middle Jurassic, the Shengbei structure zone and its south flank are favorable shallow position for secondary subtle traps exploration of Cretaceous in Shengbei sag.