Discussion of the relationship between fault activities and hydrocarbon accumulation in eastern Liaohe offshore area

Through the research on fracture characteristics and fault activities rate of Kuihuadao in eastern Liaohe offshore area, the relationship between fault activities and hydrocarbon accumulation was analyzed. The results indicated:(1)The fault activity of Longwangmiao structure is stronger than that of Kuihuadao.(2)The faults in the first member or third member of Shahejie formation are of relatively favorable oil source fractures.(3)When the absolute value of the faulted thickness is less than 100 m, the probability of obtaining hydrocarbon reservoirs is higher.(4)When the fault activities rate of Guantao formation is less than 2.5 m/Ma, the oil–bearing properties of the traps are better; when the rate in Dong–2 period is less than 35 m/Ma, it is obviously favorable for hydrocarbon accumulation preservation; when the rate in Dong–3 period is less than 66 m/Ma, it is favorable for hydrocarbon accumulation preservation in Dong–3 member and below. The comprehensive evaluation believes that the trap controlled by two favorable faults in Taikui structure is the potential favorable target.