苏德尔特地区南一段断裂向砂体侧向分流运移油气形式及其与油气富集关系

为了研究海拉尔盆地贝尔凹陷中部苏德尔特地区南一段油气聚集规律,在其断裂和砂体运移油气优势通道研究的基础上,通过断裂向砂体侧向分流运移油气形式以及和油气分布之间关系,对苏德尔特地区南一段断裂向砂体侧向分流运移油气形式及其与油气富集关系进行了研究,结果表明,苏德尔特地区南一段断裂向砂体侧向分流运移油气有4种形式:①汇聚型断裂向砂体侧向分流运移油气形式,主要分布在F1断裂的a,b,c处;②先发散后汇聚型断裂向砂体侧向分流运移油气形式,主要分布在F1断裂的d处;③发散型断裂向砂体侧向分流运移油气形式,主要分布在F2断裂的e处;④断裂无法向砂体侧向分流运移油气形式,主要分布在F3断裂的f,g处。断裂向砂体侧向分流运移油气形式不同,油气富集程度不同,在汇聚型断裂向砂体侧向分流运移油气形式分布处的F1断裂a,b,c附近,最有利于油气在南一段中运移和聚集,发现的油气储量范围最大;在先发散后汇聚型断裂向砂体侧向分流运移油气形式分布处的F1断裂d附近,较有利于油气在南一段中运移和聚集,发现的油气储量范围中等;在发散型断裂向砂体侧向分流运移油气形式分布处的F2断裂e附近,不利于油气在南一段中运移和聚集,发现的油气储量范围最小。在断裂无法向砂体侧向分流运移油气形式分布处的F3断裂f,g附近,无油气聚集,无油气储量发现。

The accumulation laws of oil and gas in the Nan 1 formation of the Sudeerte area in the middle Beier Sag of the Hailar Basin need to be explored.We studied the Nan 1 formations lateral distributary migration of oil and gas from fault to sandbody as well as its relationship with hydrocarbon accumulation,based on the study of the dominant channels of oil and gas transportation by faults and sandbodies.The results showed that there were four types of oil and gas migration.①The converging form of lateral distributary migration of hydrocarbon from fault to sandbody was mainly distributed at fault F1 a,b,and c;②the diverging first and then converging type was mainly distributed at fault F1 d;③the diverging form was mainly distributed at fault F2 e;and ④ faults that cannot divert oil and gas laterally to the sandbody were mainly distributed at fault F3 f and g.The enrichment degree of hydrocarbon was different in different lateral distributary migration forms.Fault F1 a,b and c,where oil and gas migrate to the sandbody laterally through convergent faults,was the most conducive to oil and gas migration and accumulation in the Nan 1 formation.Here,the oil and gas reserves were the largest.The first divergent and then convergent faults,like F1 d,were also favorable for oil and gas migration and accumulation,resulting in a medium large scale of oil and gas reservoir.Divergent faults,such as F2 e,were not conducive to the migration and accumulation of oil and gas,resulting in the smallest reservoir of the Nan 1 formation.Near the F3 f and g fault,where the faults cannot transfer oil and gas laterally to the sandbody,there was no oil and gas accumulation or discovery of oil and gas reserves.

国家自然科学基金项目(41872157,42072157)资助。