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谭家营西南区地处陕西省延安市安塞县谭家营乡,面积约为11 km~2,含油层系主要为长6。近年来,采油厂不断深化地质认识,解放思想,打破了以往长2油藏与长6油藏之间“补偿成藏”理论的束缚,首次在该区发现了长2油藏。根据区内102口井的钻井资料,编制了该区长2顶面构造和有效砂岩厚度等值线图。通过深入研究其长2油层组的成藏机理,充分揭示了本区长2油气富集规律及其成藏的主控因素,使得该区延长组长2油层组油气勘探取得重大突破,新增石油探明地质储量350万吨。
Tanjiaying Southwest District is located in Tanjiaying Township, Ansai County, Yan’an City, Shaanxi Province, with an area of 11 km ~ 2 and an oil-bearing formation of 6. In recent years, the oil production plant has been deepening its geological understanding and emancipating the mind, breaking the shackles of the theory of “compensation and accumulation” between the Chang 2 and Chang 6 reservoirs. For the first time, the Chang 2 reservoir was discovered in this area. Based on the drilling data of 102 wells in the area, contour maps of top 2 structure and effective sandstone thickness of this area were compiled. By deeply studying the hydrocarbon accumulation mechanism of its Chang 2 oil layer, it fully reveals the law of oil and gas accumulation in Chang 2 of this area and the main controlling factors of hydrocarbon accumulation. As a result, significant breakthroughs have been made in oil and gas exploration in the No.2 oil reservoir of the Yanchang Formation in this area. Proved geological reserves of 3.5 million tons of oil.