准噶尔盆地红车断裂带岩性地层油气藏勘探新思路

A new approach to the exploration of lithologicstratigraphic reservoirs in the Hong-Che fault belt，the Junggar Basin

陈 轩，张昌民，张尚锋 张利萍

Chen Xuan Zhang Changmin Zhang Shangfeng and Zhang Liping

从沉积层序与油气成藏的关系出发，在河流-三角洲沉积体系中，提出了“富砂之外找贫砂，贫砂之内找富砂”的岩性地层油气藏勘探新思路。运用该思路并结合层序地层理论和相关目标评价技术，在准噶尔盆地红车断裂带三叠系克拉玛依下亚组河流相中，认为中期旋回MSC2为有利的“贫砂”层系，在该层系中高弯曲指数的河道砂体为有利的“富砂”目标，针对目标提交了红山4井并获得工业油流;同样在新近系沙湾组三角洲沉积相中，认为三级层序NSQ2中的湖侵体系域为有利的“贫砂”层系，层系中的三角洲前缘水下分流河道砂体为有利“富砂”目标，针对目标提交车89井并获得油气突破。这一思路指出了“贫砂”地层也是岩性地层油气藏发育的重要场所，对我国陆相岩性地层油气藏勘探具有一定的实践意义。

Based on the relationship between sedimentary sequences and reservoir formation，the author puts for-ward a new approach to exploration of lithologic-stratigraphic reservoirs in the fluvial-delta sedimentary systems-“to look for intervals with low net-to-gross ratio outside a facies zone with high net-to-gross ratio，and to look for reservoirs with relatively high net-to-gross ratio within intervals with low net-to-gross ratio”.In combination with sequence stratigraphic theories and relevant target-evaluation techniques，this new approach is used to identify reservoirs in the1stmember of the Triassic Karamay Formation in the HongˉChefaultbelt in JunggarBasin. It is believed that the middle cycle-MSC2is the favorable“low net-to-gross ratio interval”，in which the channel sands with high curvature index are the favorable“exploration targets with relatively high net-to-gross ratio”.The exploration well（Hongshan-4）targeting at these channel sands was drilled and flowed commercial oil. Mean while，for the delta deposits in the Neogene Shawan Formation，it is believed that the transgressive system tracts in the third-order sequence-NSQ2-are the favorable“low net-to-gross ratio interval”，in which the underwater distributary channel sands at delta front are considered to be the“exploration targets with relatively high net-to-gross ratio”.The exploration well（Che-89）targeting at these sand stones was drilled and obtained discoveries. This indicates that，intervals with low net-to-gross ratio also can have well-developed lithologic-stratigraphic reservoirs. This new approach is of significance to exploration of lithologic-stratigraphic reservoirs in the terrestrial strata in China.

10.11743/ogg20100404