台缘斜坡带变形膏、盐岩下的礁体识别技术
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摘要
阿姆河盆地中石油合作区块在中、晚侏罗世沉积时期在台缘斜坡带发育大量的生物礁与巨厚的膏、盐岩沉积,形成了该区重要的储盖组合类型。由于后期受西南吉萨尔山逆冲的影响,膏、盐岩地层发生了形变与塑性流动,影响了盐下礁体的识别。针对台缘斜坡带大量分布的点礁与上覆膏、盐岩变形关系,本文从地震正演模型入手,分析两者的地震响应特征;利用时差厚度方法进行生物礁的识别;探索出古地貌与相干振幅属性相结合的方法预测生物礁储层的分布;利用优选层序格架约束稀疏反演方法,有效地消除膏、盐岩变形对生物礁储层的影响。形成了一套基于膏、盐岩变形下的礁体识别方法,提高了礁体识别精度,发现一批可供钻探的生物礁。
In a PetroChina bock of Amu-Darya Basin,lots of reef and extremely thick salt-gypsum sediments were developed in platform-edge slope during the depositional period of Middle Jurassic and Late Jurassic,which forms import types of reservoir-seal assemblages in this area.Affected by the thrusting of southwestern Gissar Mountain,deformation and plastic flow happened to the salt-gypsum sediments,which make the identification of subsalt reef more difficult.To study on the relationship between patch reefs,which massively distribute in the in platform-edge slope,and the overlying deformed salt-gypsum sediments,this paper analyzes their seismic response characteristics starting with seismic forward model,identifies reefs by isochrone method,explores a way to predict the distribution of reef reservoir through the combination of palaeogeomorphology and coherent amplitude attribute,and optimizes sparse inversion with constrains of sequence stratigraphy framework,which effectively eliminates the affection of salt-gypsum formation on reef reservoir.Finally we develop a set of suitable methods for subsalt reef identification,and discover a few reefs as prospects favorable for drilling.
In a PetroChina bock of Amu-Darya Basin,lots of reef and extremely thick salt-gypsum sediments were developed in platform-edge slope during the depositional period of Middle Jurassic and Late Jurassic,which forms import types of reservoir-seal assemblages in this area.Affected by the thrusting of southwestern Gissar Mountain,deformation and plastic flow happened to the salt-gypsum sediments,which make the identification of subsalt reef more difficult.To study on the relationship between patch reefs,which massively distribute in the in platform-edge slope,and the overlying deformed salt-gypsum sediments,this paper analyzes their seismic response characteristics starting with seismic forward model,identifies reefs by isochrone method,explores a way to predict the distribution of reef reservoir through the combination of palaeogeomorphology and coherent amplitude attribute,and optimizes sparse inversion with constrains of sequence stratigraphy framework,which effectively eliminates the affection of salt-gypsum formation on reef reservoir.Finally we develop a set of suitable methods for subsalt reef identification,and discover a few reefs as prospects favorable for drilling.
引文
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[3]马新华,华爱刚,李景明等.含盐油气盆地.北京:石油工业出版社,2000
[4]任兴国,姚声贤,罗利等.川东生物礁测井响应及判别模式.测井技术,1999,23(3):190~193Ren Xing-guo,Yao Sheng-xian,Luo Li et al.Log re-sponses to bioreef in the east of Sichuan and its identi-fication mode.Well Logging Technology,1999,23(3):190~193
[5]殷积峰,李军,谢芬等.川东二叠系生物礁油气藏的地震勘探技术.石油地球物理勘探,2007,42(1):70~75Yin Ji-feng,Li Jun,Xie Fen et al.Seismic explorationtechnology of Permian biohermal reservoir in easternSichuan area.OGP,2007,42(1):70~75
[6]王芳,温志峰,钟建华等.柴达木盆地西部生物礁的识别与测井解释.测井技术,2005,29(2):133~137Wang Fang,Wen Zhi-feng,Zhong Jian-hua et al.Logging response and interpretation on reef in West-ern Qaidam Basin,China.Well Logging Technolo-gy,2005,29(2):133~137
[7]邬光辉,黄广建,王振宇等.塔中奥陶系生物礁地震识别与预测.天然气工业,2007,27(4):40~42Wu Guang-hui,Huang Guang-jian,Wang Zhen-yu etal.The seismic identification and prediction of the reefin the Ordovician of the Central Tarim Basin.Natu-ral Gas Industry,2007,27(4):40~42
[8]刘延莉,樊太亮,薛艳梅等.塔里木盆地塔中地区中、上奥陶统生物礁滩特征及储集体预测.石油勘探与开发,2006,33(5):562~565Liu Yan-li,Fan Tai-liang,Xue Yan-mei et al.Distri-bution of the Middle-Late Ordovician reef bank reser-voir in Central Tarim Basin.Petroleum Explorationand Development,2006,33(5):562~565
[9]顾家裕,张兴阳,罗平等.塔里木盆地奥陶系台地边缘生物礁、滩发育特征.石油与天然气地质,2005,26(3):277~284Gu Jia-yu,Zhang Xing-yang,Luo Ping et al.Devel-opment characteristics of organic reef-bank complexon Ordovician carbonate platform margin in TarimBasin.Oil&Gas Geology,2005,26(3):277~284
[10]赵政璋,赵贤正,王英民等.储层地震预测理论与实践.北京:科学出版社,2005
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