摘要
在油气勘探决策中,判断断层在油气运移和聚集过程中表现出的开启或封闭性特征十分重要,但一般很难从众多影响断层启闭性的地质因素中筛选和确定有效的最佳参数。以东营凹陷南坡东段王家岗油田为研究区,根据断层两盘储层内是否发现油气及油气藏的成因关系,判识断层在油气运移过程中的启闭性。基于断层带的内部结构特征和流体行为,提出利用断层连通概率评价断层带整体在活动期间作为油气运移通道的可能性。通过典型断层油藏精细解剖,按照一定密度在断层面上逐点进行启闭性判识和统计分析,建立了断层连通概率与各种量化参数之间的统计关系,利用相关系数评价了这些地质参数表征断层启闭性的有效性。研究认为,前人提出的各种启闭性量化参数与断层连通性的关系趋势与定性认识相一致,但反映单一地质因素的参数难以确定断层在运移过程是否作为运移通道,而包含两个或数个地质因素的综合参数,如泥岩涂抹因子(SGR)、断层面正应力参数的效果明显改善;断层开启系数(FOI)与断层启闭性的关系最密切,是表征断层启闭性的有效参数。
It is critical in hydrocarbon exploration to understand the intricate role of a fault, that played during hydrocarbon migration and accumulation. And it is generally difficult to determine valid optimum parameters for the characterization of fault connectivity a- mong numerous geological factors while quantitatively evaluating fault opening and sealing. Taking Wangjiagang oilfield in Dongying depression as a studied area, we deduced the hydraulic connectivity of fault plane during hydrocarbon migration according to the oc- currence of hydrocarbon accumulation within reserviors at two sidles of faults walls and the genetic correlation between them. An in- dex, the fault-connecting probability, was used to evaluate the possibility fault acted as a migration pathway. On the basis of fault connectivity determination and data statistics for a typical faulted reservoir, a relationship between the index and any an individual pa- rameter proposed in previous works to characterize fault sealing was built to evaluate the effect of these parameters in characterizing fault connecting properties for hydrocarbon migration. By compariing the statistical correlation between each of these parameters and the fault-connecting probability, we found that the effectiveness of a parameter representing only a single geological factor is generally weak to determine whether the fault acted as a migration pathway. Some comprehensive parameters that deal implicitly or explicitly with two or more geological factors, such as the shale gouge ratio （S_GR）, can improve the effectiveness of normal stress of a fault plane substan tially. The fault opening index （F_OI） may be the best parameter to characterize the fault connecting for hydrocarbon migration.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第1期92-100,共9页
Acta Petrolei Sinica
基金
国家重大科技专项(2008ZX05008-004)
国家自然科学基金项目(No.40902041)资助
关键词
油气运移
断层启闭性
量化参数
断层连通概率
王家岗油田
hydrocarbon migration
fault opening and sealing
quantitative parameter
fault-connecting probability
Wangjiagang oilfield
