浊积体油藏储量评价中的储层展布研究及意义
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摘要
浊积体油藏储层空间展布特征的研究对于该类型油气藏的储量评价和高效开发有着重要意义。XX20-2北油田东二下段的浊积体油气藏仅为XX20-2N-2井钻遇,相邻1.9km较低部位的XX20-2-13井未钻遇储层。由于该浊积体埋深超过2 000m,单靠地震资料难以达到定量研究储层空间展布的要求。区域沉积体系分析显示,该油气藏为发育在湖泊相沉积背景下的三角洲滑塌浊积扇沉积,主要物源来自北部的辽河水系和凌河水系形成的大型三角洲;利用该区浊积体特殊地震反射特征,借助地震相识别技术,详尽刻画了砂体的空间展布特征和边界;利用测试取得的压力数据进行试井分析发现,在2井周边880m范围内,储层物性和连通性较好,说明浊积体展布半径要更大;利用得出的浊积体地质模型进行模型正演发现,正演结果与实际地震剖面吻合较好,从而证实了浊积体空间展布及边界的推断。
The understanding of the distribution of a turbidite reservoir is critical for reserve assessment and oilfield development.The turbidite reservoir at the E_3d2L Formation of the XX20-2N Oilfield is buried at a depth more than 2000 m below sea level.It is difficult to make clear the distribution pattern of the turbidite reservoir only by seismic information.Regional research reveals that the turbidite reservoir was a lacustrine turbidite caused by the sliding of the deltaic front.We applied all the approaches,such as depositional system study,facies modeling,seismic facies analysis,well testing and DST pressure data,in this study to delineate the boundaries and dimensional features of the turbidite sand reservoir.The results of the study were useful for calculation of the net pay thickness of oil and gas unit and increasing the precision of reserve calculation so as to decrease the risk thereof.
The understanding of the distribution of a turbidite reservoir is critical for reserve assessment and oilfield development.The turbidite reservoir at the E_3d2L Formation of the XX20-2N Oilfield is buried at a depth more than 2000 m below sea level.It is difficult to make clear the distribution pattern of the turbidite reservoir only by seismic information.Regional research reveals that the turbidite reservoir was a lacustrine turbidite caused by the sliding of the deltaic front.We applied all the approaches,such as depositional system study,facies modeling,seismic facies analysis,well testing and DST pressure data,in this study to delineate the boundaries and dimensional features of the turbidite sand reservoir.The results of the study were useful for calculation of the net pay thickness of oil and gas unit and increasing the precision of reserve calculation so as to decrease the risk thereof.
引文
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[2]孙龙德.东营凹陷中央隆起带沉积体系及隐蔽油气藏[J].新疆石油地质,2000,21(2):123-127.
[3]Stow D A V,Mayall M.Deep-water sedimentary systems:New models for 21st century[J].Marine and Petroleum Ge-ology,2000,17:125-135.
[4]鄢继华,陈世悦,宋国奇,等.三角洲前缘滑塌浊积岩形成过程初探[J].沉积学报,2004,22(4):573-578.
[5]鄢继华,陈世悦,姜在兴.三角洲前缘浊积体成因及发布规律研究[J].石油实验地质,2008,30(1):16-25.
[6]徐长贵,许效松,丘东洲,等.辽东湾地区辽西凹陷中南部古近系构造格架与层序地层格架及古地理分析[J].古地理学报,2005,7(4):449-459.
[7]吴小红,吕修祥,加东辉,等.辽中凹陷东营组重力流发育机制及沉积构成[J].西南石油大学学报,2009,31(4):18-23.
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