渤海海域渤中西洼断裂控藏作用定量分析——以曹妃甸12-6油田为例

Quantitative analysis of control of faults on hydrocarbon accumulation in the west of Bozhong Subsag of Bohai Sea:A case study of CFD12-6 Oilfield

为明确断裂对渤中西洼新近系油气成藏的控制作用,基于断裂结构、分布特征及输导机理的详细分析,首次提出应用断接盖层参数和断裂输导能力指数对油源断裂的垂向输导能力进行定量评价。研究结果表明:断接盖层参数和断裂输导能力指数可以有效地定量表征曹妃甸12-6油田不同构造带的油气充注能力及富集层位。研究区北部断裂带断接盖层参数较大、断裂输导能力指数较小,油气充注能力较弱,油气富集于馆陶组;南部断裂带断接盖层参数较小、断裂输导能力指数较大,油气充注能力较强,油气富集于明化镇组。根据断裂输导能力的不同,分别建立曹妃甸12-6油田南、北断裂带油气成藏模式,其中北部断裂带为"源-断-砂"侧向分流式油气成藏模式,南部断裂带为"源-不整合-断"垂向贯穿式油气成藏模式。

In order to understand the control of faults on hydrocarbon accumulation in the Neogene of the west of Bozhong Subsag,based on the detailed analysis of fault structure,distribution characteristics and transport mechanism,it was first proposed to quantitatively evaluate the vertical transmission capacity of the faults by using the fault-caprock parameter and fault-transporting ability index.The result indicates that the fault-caprock parameter and fault-transporting ability index can effectively quantitatively characterize the hydrocarbon charging capacity and hydrocarbon accumulation strata of differ?ent tectonic belts in CFD12-6Oilfield.In the northern fault zone,the fault-caprock parameters are larger and the faulttransporting ability index is smaller,and thus the hydrocarbon charging capacity is relatively weak and the hydrocarbon is mainly accumulated in the Guantao Formation;while in the southern fault zone,the fault-caprock parameters are smaller and the fault-transporting ability index is much larger,and thus the hydrocarbon charging capacity is much stronger and the hydrocarbon is mainly accumulated in the Minghuazhen Formation.Based on the fault transmission capacity,the hydro?carbon accumulation models for the north-south fault zone in CFD12-6Oilfield were established.The"Hydrocarbon-Fault-Sand"lateral diversion reservoir model is for the northern fault zone;while the"Hydrocarbon-Unconformity-Fault"vertical penetrating reservoir model is mainly for the southern fault zone.