摘要
吐哈盆地台北凹陷葡北地区中侏罗统七克台组油气藏受岩性控制。早期勘探证实,葡北地区七克台组底部发育厚度为6~15 m的含油薄砂层。常规反演方法对该薄砂层的预测存在难点,且常规反演方法受地震资料频带限制,反演误差大。为了提高反演精度,提出了基于低频模型优化的相控地质统计学反演方法。结合研究区构造高差大及沉积相带变化快的特点,联合压实趋势校正法和地震属性约束法建立低频模型,得到确定性反演结果,并据此建立相控模型,进而开展相控地质统计学反演,实现对研究区薄砂层的识别。该方法既有效补充了地震信号中缺少的低频信息,又提高了反演结果的纵向分辨率。利用该方法可识别厚度为7 m的薄砂层,反演结果与实钻砂体厚度基本吻合,证实了该方法在葡北地区薄砂层预测中的有效性。
The oil and gas reservoirs in the Qiketai formation of Middle Jurassic in the Pubei area of Taibei sag,Turpan-Hami basin,are controlled by lithology.Early exploration confirmed that there are thin oil-bearing sand layers with the thickness of 6-15 m at the bottom of the Qiketai formation.It is difficult for conventional inversion methods to predict these sand layers and these methods often yield large errors due to the limitations of the frequency band of seismic data.In order to improve inversion accuracy,a facies-controlled geostatistical inver-sion method based on low-frequency model optimization was proposed.Combined with the characteristics of large structural relief and great-ly varying sedimentary facies in the study area,the low-frequency model was established by combining the compaction trend correction meth-od and the seismic attribute constraint method to obtain the deterministic inversion results.On this basis,a facies-controlled model was es-tablished for facies-controlled geostatistical inversion,thus enabling the identification of thin sand layers in the study area.This method ef-fectively complements the low-frequency information missed in seismic signals,and improves the longitudinal resolution of the inversion re-sults.By using this method,a thin sand layer with the thickness of 7 m can be identified,and the inversion result is basically consistent with the actual thickness of sand body,which confirms the effectiveness of this method in predicting thin sand layers in Pubei area.
作者
石楠
刘源
冷玥
文一华
潘海峰
孙博
王兵
SHI Nan;LIU Yuan;LENG Yue;WEN Yihua;PAN Haifeng;SUN Bo;WANG Bing(Urumqi Branch,Geophysical Research Institute of BGP,CNPC,Urumqi,Xinjiang 830000,China;PetroChina Tuha Oilfield Company,Exploration Department;PetroChina Tuha Oilfield Company,Research Institute of Exploration and Development,Hami,Xinjiang 839009,Chin)
出处
《新疆石油地质》
CAS
CSCD
北大核心
2023年第3期375-382,共8页
Xinjiang Petroleum Geology
基金
中国石油前瞻性基础性技术攻关项目(2022DJ0507)。
关键词
吐哈盆地
葡北地区
七克台组
低频模型
压实趋势
地震属性
相控模型
地质统计学反演
Turpan-Hami basin
Pubei area
Qiketai formation
low-frequency model
compaction trend
seismic attribute
facies-controlled model
geostatistical inversion
