摘要
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 forward 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 the 1 st member of the Triassic Karamay Formation in the Hong-Che fault belt in Junggar Basin. It is believed that the middle cycle-MSC2 is 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 distri- butary 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 sandstones was drilled and obtained discoveries. This indi- cates 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.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2010年第4期420-427,共8页
Oil & Gas Geology
基金
国家自然科学基金项目(40602013
40572078)
关键词
河流
三角洲
层序地层
岩性地层油气藏
红车断裂带
准噶尔盆地
river, delta, sequence stratigraphy, lithologic-stratigraphic reservoir, Hong-Che fault belt, Junggar Basin
