下寺湾式岩性封闭裂缝油藏的建立

On the Xiasiwan-Style Lithological-Close Fractural Oil Reservoir

在下寺湾油田裂缝高产井泉5925-3和5915井延伸线上所布置的桦3井,采到含油的张性裂缝岩心,取得丰富的油气地质信息。原油分析对比表明,相邻的两个裂缝高产井和相距较远的一个裂缝高产井,其原油都是以低碳烃为主的特低凝原油,但与紧邻的正常产量井原油同源异性。这说明本区的裂缝高产井有着相同的成藏地质过程,并且成片、成带、有规律分布,把这种油藏命名为下寺湾式岩性封闭裂缝油藏。研究这种油藏的形成及分布规律,将为鄂尔多斯盆地油气勘探打开一个新的领域。

Plentiful information from oil-bearing core samples with tension fractures wrer collected from Hua-3 well at the extended line of high production fractural well Quan 5925-3 and Quan 5915 of Xiasiwan oil Field. Analysis to crude oil shows that oil from high production fractural well has very low freezing with low hydrocarbon. But the crude oil of adjacent normal production well come form the same sorce as high production fractural well but is different in nature. This shows that these high production fractural wells have a same geological process of forming oil reservoir. This kind of oil reservoir is named Xiasiwan-style lithological-elosed fracture oil reservoir.