摘要
油气运移优势通道研究对于追踪油气运移方向和预测有利勘探目标具有重要意义,在对柴北缘地区输导层砂体展布、主要成藏期古流体势、断层倾角和区域盖层分割槽等地质条件综合研究的基础上,分别阐述了级差优势、流向优势、流压优势和分割槽优势等4种类型优势通道的分布特征以及对油气运移的单因素控制作用,然后进行多因素叠加,综合分析在4种优势通道共同作用下柴北缘地区的油气优势运移方向,进而优选勘探目标.结果表明:冷湖-南八仙构造带具有阿尔金斜坡、赛什腾、鱼卡-南八仙3个大规模沉积体系的级差优势通道,同时流压优势通道、分隔优势通道和流向优势通道分布范围广,并且处于昆特依凹陷和伊北凹陷油气的运移指向区,使得该构造带成为最有利的油气聚集带,其次是鄂博梁Ⅰ号-葫芦山构造带;冷湖七号东、西高点深层构造和葫芦山构造为最有利的勘探目标,有望取得新的突破.
Dominant migration pathway is an effective method for predicting hydrocarbon migration and favorable traps. Dominant migration pathway can be mainly divided into four models including predominances caused respectively by porosity and permeability difference relative to surrounding rocks, excursion of sedimentation center of caprocks, fluid pressure, or fault obliquity. Based on studies on sandbody distribution, paleo-fluid potential in pool-forming period, fault obliquity and excursion of sedimentation center of caprocks, the distribution and controlling on hydrocarbon migration of every types of dominant migration pathways in the northern edge of Qaidam basin were expatiated. And then hydrocarbon migration and favorable traps in the northern edge of Qaidam basin were predicted by integrated the controlling on hydrocarbon of different types of dominant pathways. The study results show that Lenghu-Nanbaxian structural belt is the most favorable accumulation zone for it is located in the area of four types dominant pathways, followed by Eboliang-Hulushan structural belt, and structural heights of No. 7 Lenghu structure and Hulushan structure are the most favorable exploration targets.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2006年第2期214-220,共7页
Earth Science-Journal of China University of Geosciences
基金
国家"十五"天然气(二期)攻关项目(No.2004BA616A-04)
国家自然科学基金项目(No.40472078).
关键词
优势通道
油气运移
砂体展布
古流体势
断层倾角
柴北缘
dominant migration pathways oil-gas migrations sandbody distributions paleo-fluid potentials fault obliquitys the northern edge of Qaidam basin.
