川东北元坝气田长兴组生物礁精细刻画及储层预测
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摘要
四川盆地川东北元坝气田长兴组生物礁气藏是目前埋藏最深的气藏,埋深超过6000m。二叠系长兴组台地边缘生物礁礁体规模小、分布散,纵向发育多期,平面组合方式不一,储层薄、非均质性强、气水关系复杂。为实现水平井水平段长穿优质储层,提高开发效率,开展了生物礁精细刻画及储层预测:利用古地貌恢复和地震反射特征技术,结合三维可视化雕刻技术,刻画了生物礁及其内幕期次;运用地质统计学反演技术提高了储层预测的精度。结果表明,元坝生物礁沿台缘呈条带展布,不同礁带内部礁体发育单期或多期礁;优质储层主要发育于礁盖部位,预测结果与钻井揭示结果符合度较高,为元坝气田开发方案的编制和井位部署提供了技术支撑。
Reef gas reservoir of Changxing Formation was the deepest buried gas reservoir in the northeast Sichuan Basin,of which the buried depth was more than 6000 m.The biological reefs of the Permian Changxing Formation were small scaled and scattered with multi-stage development vertically,plane combination style was different with thin reservoir,strong heterogeneity,complex relationship between gas and water.The key points included fine characterization of small reef body and thin reservoir prediction.From the development point of view,to realize the high quality reservoir in long horizontal section of horizontal wells,improve development efficiency,fine characterization of reefs and reservoir prediction were carried out.The reef and insider periods were studied by adopting Paleogeomorphic restoration and seismic reflection characteristics and combined with 3 D visualization engraving technology.The accuracy of reservoir prediction was improved by geostatistical inversion.The results indicate that the reefs of Yuanba Gas Field are strip distribution along with the edge of the platform,the reefs are developed in single period or multi-periods in the inside of different reef zones.High quality reservoirs are mainly developed in the reef cover.The forecast results are in line with that of well drilling.It provides a technical support for the production planning and well location deployment in Changxing Formation of Yuanba Gas Field.
Reef gas reservoir of Changxing Formation was the deepest buried gas reservoir in the northeast Sichuan Basin,of which the buried depth was more than 6000 m.The biological reefs of the Permian Changxing Formation were small scaled and scattered with multi-stage development vertically,plane combination style was different with thin reservoir,strong heterogeneity,complex relationship between gas and water.The key points included fine characterization of small reef body and thin reservoir prediction.From the development point of view,to realize the high quality reservoir in long horizontal section of horizontal wells,improve development efficiency,fine characterization of reefs and reservoir prediction were carried out.The reef and insider periods were studied by adopting Paleogeomorphic restoration and seismic reflection characteristics and combined with 3 D visualization engraving technology.The accuracy of reservoir prediction was improved by geostatistical inversion.The results indicate that the reefs of Yuanba Gas Field are strip distribution along with the edge of the platform,the reefs are developed in single period or multi-periods in the inside of different reef zones.High quality reservoirs are mainly developed in the reef cover.The forecast results are in line with that of well drilling.It provides a technical support for the production planning and well location deployment in Changxing Formation of Yuanba Gas Field.
引文
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[2]郭旭升,郭彤楼.元坝碳酸盐岩台地边缘大气田勘探理论与实践[M].北京:科学出版社,2012.
[3]徐安娜,汪泽成,江兴福,等.四川盆地开江-梁平海槽两侧台地边缘形态及其储层发育的影响[J].天然气工业,2014,34(4):37~43.
[4]马永生,牟传龙,谭钦银,等.关于开江-梁平海槽的认识[J].石油与天然气地质,2006,27(3):326~331.
[5]邓剑,段金宝,王正和,等.川东北元坝地区长兴组生物礁沉积特征研究[J].西南石油大学学报(自然科学版),2014,36(4):63~72.
[6]段金宝,黄仁春,程胜辉,等.川东北元坝地区长兴期-飞仙关期碳酸盐岩台地沉积体系及演化[J].成都理工大学学报(自然科学版),2008,35(6):663~668.
[7]王正和,邓剑,谭钦银,等.元坝地区长兴组典型沉积相及各相带物性特征[J].矿物岩石,2012,32(2):86~96.
[8]郭彤楼.元坝深层礁滩气田基本特征与成藏主控因素[J].天然气工业,2011,31(10):12~16
[9]刘殊,唐建明,马永生,等.川东北地区长兴组-飞仙关组礁滩相储层预测[J].石油与天然气地质,2006,27(3):332~347.
[10]刘殊,郭旭升,马宗晋,等.礁滩相地震响应特征和油气勘探远景[J].石油物探,2006,45(5):452~458.
[11]胡伟光,蒲勇,赵卓男,等.川东北元坝地区生物礁识别[J].物探与化探,2010,34(5):635~642.
[12]蒲勇.元坝地区深层礁滩储层多尺度地震识别技术[J].天然气工业,2011,31(10):27~31.
[13]刘殊,张虹,唐建明,等.川西坳陷二叠系礁滩相预测及油气远景评价[J].石油物探,2014,53(1):106~115.
[14]罗志立.峨眉地裂运动和四川盆地天然气勘探实践[J].新疆石油地质,2009,30(4):419~424.
[15]王一刚,文应初,张帆,等.川东地区上二叠统长兴组生物礁分布规律[J].天然气工业,1998,18(6):10~15.
[16]金振奎,石良,高白水,等.碳酸盐岩沉积相及相模式[J].地质学报,2013,31(6):965~979.
[17]钟怡江,陈洪德,林良彪,等.川东北地区长兴期-飞仙关期沉积体系分析[J].石油物探,2010,49(5):522~530.
[18]程锦翔,谭钦银,郭彤楼,等.川东北元坝地区长兴组-飞仙关组碳酸盐台地边缘沉积特征及演化[J].沉积与特提斯地质,2010,30(4):29~37.
[19]郭彤楼.川东北元坝地区长兴组-飞仙关组台地边缘层序地层及其对储层的控制[J].石油学报,2011,32(3):387~394.
[20]郑荣才,罗平,文其兵,等.川东北地区飞仙关组层序-岩相古地理特征和鲕滩预测[J].沉积学报,2009,27(1):1~8.
[21]龙胜祥,游瑜春,刘国萍,等.元坝气田长兴组超深层缓坡型礁滩相储层精细刻画[J].石油与天然气地质,2015,36(6):994~1000.
[22]何永垚,王英民,许翠霞,等.生物礁、滩、灰泥丘沉积特征及地震识别[J].石油地球物理勘探,2014,49(5):971~984.
[23]吴亚生,范嘉松,生物礁的定义和分类[J].石油与天然气地质,1991,12(3):346~349.
[24]武恒志,李忠平,柯光明,等.元坝气田长兴组生物礁气藏特征及开发对策[J].天然气工业,2016,36(9):11~19.
[25]韩东,胡向阳,邬兴威,等.基于地质统计学反演的缝洞储集体物性定量评价[J].地球物理学进展,2016,31(2):655~661.
[26]张义,尹艳树,秦志勇,等.地质统计学反演在薄砂体储层预测中的应用[J].断块油气田,2015,22(5):565~569.
[27]闫玲玲,刘全稳,张丽娟,等.叠后地质统计学反演在碳酸盐岩储层预测中的应用:以哈拉哈塘油田新垦区块为例[J].地学前缘,2015,22(6):177~184.