油成藏模式及对油分布的控制作用——以海塔盆地中部主要断陷带为例

Oil Accumulation Models and Their Controlling to Oil Distribution——An example from main central depression zones of Haita Basin

通过钻井和油藏解剖得到,海塔盆地中部主要断陷带油藏类型除少量基岩潜山油藏外,主要为断层油藏,纵向上以南一段自生自储式生储盖组合油最富集,平面上呈11个富集区分布,以塔南中次凹和贝中-南贝尔东次凹北洼槽油更富集。油成藏可分为自生自储式、下生上储式和上生下储式3大类成藏模式,自生自储式又可分为洼中隆、缓坡断阶带和陡坡断阶带或断鼻3种成藏模式,油成藏模式对油分布的控制作用表现在3个方面:①缓坡断阶带油成藏模式是油富集的最主要成藏模式;②成藏模式越发育的的层位,油就越富集;③成藏模式越发育的地区,油也就越富集。

By wells and anatomy of oil reservoirs,it was considered that type of oil reservoirs is mainly fault oil reservoirs except a lot of bedrock oil reservoirs.Oil is the most abundent in combination of sourcerock and reservoir itself of k1n1,there are 11 accumulation in plane,oil is more abundent in central subsag of Tanan depression and Beizhong～north sag of Nanbeier depression.There are three oil accumulation models of combination of sourcerock and reservoir itself,combination of lower sourcerock and upper reservoir and combination of upper sourcerock and lower reservoir.The oil accumulation model of combination of soucerock and reservoir itself can be divided into three oil accumulation models on uplift in sag,fault terrace of slow slope and fault terrace of steep slope.Oil accumulation models control oil distribution in three following aspect： ① oil accumulation model on fault terrace of slow slope is the most oil accumulation model;② the more developing oil accumulation model in the horrizon are,the more abundent oil accumulation is;③ the more developing oil accumulation models in the area are,the more abundant.