摘要
碳酸盐岩台缘带类型对储层形成与油气产能具有重要的控制作用。利用塔北地区大量最新的地震资料与钻井资料,通过上奥陶统良里塔格组地层厚度变化刻画台缘带平面展布,基于台缘带地层坡度的计算揭示其不同段台缘类型的差异。在此基础上,探讨台缘带分段性对储层发育的控制作用。结果表明:①良里塔格组台缘带具有明显地层加厚的特点,平面上环塔北古隆起呈条带状展布,长约240km、宽约10～20km,面积达2600km^2。②基于台缘带地层坡度的变化,明确了良里塔格组台缘带沿东西方向表现为不同的类型,具有一定的分段性。西段为弱镶边型台地边缘,分布在英买力—哈拉哈塘—托普台地区,地震响应为向盆地方向减薄的楔形反射,地层坡度较大,介于1°～3°;东段为宽缓的缓坡型台地边缘,分布在塔河东部—轮古东—于奇地区,在地震剖面上由台地向盆地方向表现为一个波谷同相轴逐渐变细直至消失,地层坡度较小,介于0.2°～1°。③台缘带的分段性造成东、西段储层发育的差异性。西段储层品质好,厚度大,横向变化大;东段储层品质稍差,厚度小,平面分布广。塔北地区良里塔格组台缘带分段性对于优选有利勘探区带具有一定的指导意义。
Carbonate platform margin types play an important role in reservoir formation and oil and gas productivity.Based on newly acquired 3 Dseismic data and the latest drilling data,first we obtain the distribution of Lianglitage platform margins with platform margin strata thickness variations,and calculate different platform margin types with strata slopes in the study area.Then we analyze the control of margin types on reservoir development and oil and gas accumulation.The following understandings are obtained:(1)In Lianglitage platform margin,strata become obviously thicker,the Tabei palaeo-uplift is banded near EW surrounding with about 240 km long from east to west and 10~20 km wide from north to south,the total area is about 2600 km2;(2)Based on the stratigraphic slope variation in platform margin,the Lianglitag platform margin shows as different margin types along the east-west direction and has certain segments.The western part located in Yingmaili-HalahatangTuoputai area is weak rimmed carbonate platform margin with steep margin slope(1°to 3°).Seismic response of the platform margin is a cuneate reflection thinning to the basin.The eastern part located in eastern Tahe-Lungudong-Yuqi area is ramp type platform margin with gentle margin slope(0.2°to1°);On seismic sections,the platform margin is shown as a trough gradually tapering to disappear to the basin.(3)The segments of the Lianglitage platform margin resulted in the reservoir difference in these two parts.Reservoirs in the western part are thick and good quality,but with large lateral variation.Reservoirs in the eastern are part thin and poor quality,but with wide distribution.The segmentation of Lianglitage platform margin has important significance for selecting favorable exploration area in Tabei.
作者
马德波
李洪辉
崔文娟
李婷婷
朱文平
MA Debo;LI Honghui;CUI Wenjuan;LI Tingting;ZHU Wenping(Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China;National Geological Library of China, Beijing 100083, China;Exploration & Development Institute, Tarim Oil Field Company, PetroChina, Korla, Xinjiang 841000, China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2019年第1期198-207,I0008,I0009,共12页
Oil Geophysical Prospecting
基金
国家科技重大专项"下古生界-前寒武系碳酸盐岩油气成藏规律
关键技术与目标评价"(2016ZX05004-001)资助
关键词
塔北地区
良里塔格组
台缘带
分段性
地层坡度
Tabei
Lianglitage Formation
platform margin
segmentation
stratigraphic slope
