莺歌海盆地浅层气藏的形成条件及勘探技术
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摘要
莺歌海盆地浅层气藏目的层属上新统和第四系海相沉积，储集层为浅海陆架陆坡环境的滨外浅滩、滨外砂坝等，埋深４００～１５００ｍ，具较好的储盖组合条件。３套烃源岩分别是下伏的始新统—渐新统、中新统和上新统。在高地温梯度的影响下，高成熟的天然气沿垂向或侧向运移而聚集成藏。采用了高分辨率地震、低阻气层识别、配套气藏描述等新技术，提高了勘探效率和成功率。目前已发现６个含气构造、证实３个大中型气田，探获天然气地质储量１６００×１０８ｍ３。
The targe zones of the shallow gas reservoirs in Yinggehai Basin belong to Pliocene and Quaternary marine.With 400～1 500 m of buried depth and good reservoir cap assemblage,the reservoirs are offshore shoals.offshore bars etc.in the conditions of shallow sea continental shelf and aktian. 3 sets of hydrocarbon source rock are respectively underlying Eocene—Oligocene,Miocene and Pliocene.Affected by high geotemperature gradient,high mature gas vertically and laterally migrated to accumulate into reservoirs.exploration efficiency and success ratio are enhanced by the new techniques of high resolution seismic,low gas barrier bed indentification,matching gas reservoir description etc.Up till now,6 gas bearing structures hane keen dislovered;3 large middle gas fields have keen verified;and 16×10 10 m 3 of reserves in place are explorated.
The targe zones of the shallow gas reservoirs in Yinggehai Basin belong to Pliocene and Quaternary marine.With 400～1 500 m of buried depth and good reservoir cap assemblage,the reservoirs are offshore shoals.offshore bars etc.in the conditions of shallow sea continental shelf and aktian. 3 sets of hydrocarbon source rock are respectively underlying Eocene—Oligocene,Miocene and Pliocene.Affected by high geotemperature gradient,high mature gas vertically and laterally migrated to accumulate into reservoirs.exploration efficiency and success ratio are enhanced by the new techniques of high resolution seismic,low gas barrier bed indentification,matching gas reservoir description etc.Up till now,6 gas bearing structures hane keen dislovered;3 large middle gas fields have keen verified;and 16×10 10 m 3 of reserves in place are explorated.
引文
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