摘要
塔河和轮南油田分处塔里木盆地阿克库勒凸起的南北两地,构造位置上具有北高南低的特点,构造活动差异及后期改造作用的不同造成两地储层发育具有不同的特征。根据沙107井和轮古40井储层发育特征的对比研究发现,轮古40井地处北部构造高点的轮南油田地区,奥陶系碳酸盐岩储层发育厚度较薄,缺失地层严重,奥陶系仅发育中下统的鹰山组,但由于该套储层距离上部不整合面近,风化壳储层发育,缝洞系统发达,形成了一套优质的油气储集体。沙107井所在的塔河油田地处南部斜坡地带,奥陶系发育较为齐全,但上部巨厚的上奥陶统非岩溶性地层阻碍了下部中下奥陶统储层的后期岩溶改造作用,又由于中下奥陶统储层远离上部不整合面,因此孔、缝、洞的发育均受到限制,储集性能远不如上奥陶统缺失的北部地区储层。
Tahe and Lunnan oil fields are respectively located in the south and the north of the Akekule Uplift, the Tarim Basin. In terms of structural location, it was characterized by structural high in the north and low in the south. The difference of structural actions and the late alteration resulted in the dif- ferent characteristics of the reservoirs in the two parts. According to the comparative study of the reser- voir characteristics in the Well S107 and the Well LG40, some new findings have been got. The Well LG40 is located at the Lunnan oil field which was in the structural high in the north of the Akekule Uplift. The Ordovician carbonate reservoirs are relatively thin thickness. Most part of the Ordovician sequence is absent, with the only stratum is the Yingshan group of the Middle--Lower Ordovician. However, owing to its near the upper unconformity surface, the weathering crust reservoirs was developed and the fractures and the cores were well developed to form an excellent reservoirs. The Tahe oil field where the Well S107 located at is in the southern slope area of the Akekule. The Ordovician sediments were comparatively integrity. But the quite thick Upper Ordovician un-karstic strata made the Middle-- Lower Ordovician obstructed from the karst alteration. Besides, due to the Middle--Lower Ordovician sequence was far from the upper unconformity surface, the development of the cores, fractures and holes were limited. The reservoir quality is much poorer compared with the reservoir of the northern area in which the Upper Ordovician was absent.
出处
《石油实验地质》
CAS
CSCD
北大核心
2008年第3期247-251,共5页
Petroleum Geology & Experiment
基金
国家重点基础研究发展计划(973计划)项目(2005CB422108)
关键词
碳酸盐岩
奥陶系
储层
轮南油田
塔河油田
塔里木盆地
carbonate
Ordovician
reservoir
Lunnan oil field
Tahe oil field
the Tarim Basin
