四川盆地高峰场地区长兴组生物礁气藏类型研究
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摘要
四川盆地北部环开江—梁平海槽区带长兴组生物礁气藏是四川气田未来增储上产的重要领域之一。生物礁气藏系成因较复杂的岩性圈闭气藏,储层非均质性强。受地质认识程度、地震资料品质及处理解释技术的局限,长兴组生物礁储层和圈闭预测有着较大的难度。长期以来,对海槽东侧高峰场地区长兴组生物礁气藏的认识一直存在分歧,这对海槽东侧生物礁气藏滚动勘探开发部署决策有较大的影响。从沉积相、储层特征、地震响应特征以及气藏动态等方面进行研究,认为高峰场地区位于开江—梁平海槽东侧的碳酸盐缓坡相带,峰X井、峰Y井和峰Z井分别钻遇了两个规模较小的点礁,礁体规模有限。高峰场地区长兴组生物礁气藏属于小型的中深埋深、高压无水干气岩性圈闭气藏,在该区内进行生物礁气藏专层井勘探存在较大的风险,需谨慎部署。
Bioreef gas reservoir of Changxing Formation around the Kaijiang-Liangping Trough,northern Sichuan Basin,will be one of the most important domains for increasing reserve and production in the future.In genesis,the reservoir is more complex lithological trap one and characterized by strong heterogeneity.It is more difficult to predict the bioreef reservoir and trap of Changxing Formation because of less geological acknowledge,and limit seismic-data quantity and interpretation technology.Differences exist in recognizing the bioreef reservoir in Gaofengchang area of eastern trough for a long time,resulted in a large effect on deployment of exploration and development strategy.In this paper,some aspects of sedimentary facies,reservoir characteristics,seismic-response feature and reservoir performance are fully studied.It is considered that(1) Gaofengchang area is located at carbonate gentle-slope facies belt in eastern trough;(2) Feng X,Feng Y and Feng Z wells encountered respectively two small-scale point reefs with limit reef body;(3) the bioreef gas reservoir belongs to a small lithological trap with middle to deep burial depth,and high pressure and without water.Generally,great care must be needed during the deployment of exploration and development due to a higher risk.
Bioreef gas reservoir of Changxing Formation around the Kaijiang-Liangping Trough,northern Sichuan Basin,will be one of the most important domains for increasing reserve and production in the future.In genesis,the reservoir is more complex lithological trap one and characterized by strong heterogeneity.It is more difficult to predict the bioreef reservoir and trap of Changxing Formation because of less geological acknowledge,and limit seismic-data quantity and interpretation technology.Differences exist in recognizing the bioreef reservoir in Gaofengchang area of eastern trough for a long time,resulted in a large effect on deployment of exploration and development strategy.In this paper,some aspects of sedimentary facies,reservoir characteristics,seismic-response feature and reservoir performance are fully studied.It is considered that(1) Gaofengchang area is located at carbonate gentle-slope facies belt in eastern trough;(2) Feng X,Feng Y and Feng Z wells encountered respectively two small-scale point reefs with limit reef body;(3) the bioreef gas reservoir belongs to a small lithological trap with middle to deep burial depth,and high pressure and without water.Generally,great care must be needed during the deployment of exploration and development due to a higher risk.
引文
1刘划一,张静,洪海涛.四川盆地东北部长兴组—飞仙关组气藏形成条件研究[J].天然气勘探与开发,2001,(2):30-38.
2王一刚,洪海涛,夏茂龙,等,四川盆地二叠、三叠系环海槽礁、滩富气带勘探[J].天然气工业,2008,28(1).
2王一刚,洪海涛,夏茂龙,等,四川盆地二叠、三叠系环海槽礁、滩富气带勘探[J].天然气工业,2008,28(1).
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