珠江口盆地恩平凹陷文昌组浊积体含油气性分析
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摘要
岩性油气藏是目前油气勘探开发的重要方向和热点研究领域。珠江口盆地恩平凹陷古近系文昌组发育一厚300余米、面积约140km2的浊积砂体,其上下岩性均为深湖—半深湖相暗色细粒沉积物。文昌组是该盆地最主要的烃源岩,具有形成岩性油气藏的物质条件。以地震资料为主,结合地质和测井等综合技术,对该浊积体的含油气性进行了综合分析。研究表明,浊积体具有低频振幅能量增强、高频振幅能量降低的特点;同时AVO异常,在浊积体下部表现出同相轴下拉现象。EP17-3-1井钻遇该浊积体边缘,在浊积砂体深度(4552～4642m)出现异常高压。这些特点都是含油气的表现。因此,该浊积砂体是有利的勘探目标,也是该区获得油气勘探开发重大突破的希望所在。
Exploration and development of lithologic oil-gas reservoirs are important directions and hot research areas.Zhu-1 Depression of Pearl River Mouth Basin has an annual crude oil output over 10 million tons,but the industrial value of the reservoir has not been found in sub-tectonic units:Enping Depression.In lower Tertiary Wenchang Formation in Enping Depression,there is a set of turbidite sand with 300 meters thickness and 140 km2 area and up and down it are half-deep to deep lacustrine sedimentary facies fine sediments.Geological and geochemical study shows that the main hydrocarbon source rocks from Wenchang Formation developed well and there is the condition to form lithologic Oil-gas reservoirs.Based on seismic data,combined geological and logging technology,hydrocarbon potential of turbidite has been comprehensively analyzed in Enping Depression from Lower Tertiary Wenchang Formation.Seismic information indicates that the turdibite has a low frequency energy boost up and high frequency energy depressed character;AVO anomaly in the same time,in-phase axes descend in the below of the turdibite.Well EP17-3-1 is the margin of the turdibite,an anomaly high pressure has been detected in the 4552-4642 meters depth.All the above shows oil-gas bearing character.So,the turdibite is a favorable exploration object and of the hope for the exploration and development of oil-gas reservoirs in Enping Depression.
Exploration and development of lithologic oil-gas reservoirs are important directions and hot research areas.Zhu-1 Depression of Pearl River Mouth Basin has an annual crude oil output over 10 million tons,but the industrial value of the reservoir has not been found in sub-tectonic units:Enping Depression.In lower Tertiary Wenchang Formation in Enping Depression,there is a set of turbidite sand with 300 meters thickness and 140 km2 area and up and down it are half-deep to deep lacustrine sedimentary facies fine sediments.Geological and geochemical study shows that the main hydrocarbon source rocks from Wenchang Formation developed well and there is the condition to form lithologic Oil-gas reservoirs.Based on seismic data,combined geological and logging technology,hydrocarbon potential of turbidite has been comprehensively analyzed in Enping Depression from Lower Tertiary Wenchang Formation.Seismic information indicates that the turdibite has a low frequency energy boost up and high frequency energy depressed character;AVO anomaly in the same time,in-phase axes descend in the below of the turdibite.Well EP17-3-1 is the margin of the turdibite,an anomaly high pressure has been detected in the 4552-4642 meters depth.All the above shows oil-gas bearing character.So,the turdibite is a favorable exploration object and of the hope for the exploration and development of oil-gas reservoirs in Enping Depression.
引文
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4邵磊,雷永昌,庞雄,等.珠江口盆地构造演化及对沉积环境的控制作用[J].同济大学学报(自然科学版),2005,33(9):1178-1181[Shao Lei,Lei Yongchang,Pang Xiong,et al.Tectonic evolution and controlling for sedimentary environment in Pearl River Mouth Basin[J].Journal of TongJi University(Natural Science),2005,33(9):1178-1181]
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7赖婉琦,顾家裕.渤海湾含油气盆地中的浊积岩[J].沉积学报,1980,(17):799-801[Lai Wanqi,Gu Jiayu.Turbidity fan in the oil and gas bearing basin in Bohai Bay[J].Acta Sedimentologica Sinica,1980,(17):799-801]
8高延新,吴崇筠,庞增福,等.辽河盆地大湾河油层湖底扇沉积特征[J].沉积学报,1985,3(4):83-94[Gao Yanxin,Wu Chongyun,Pang Zengfu,et al.The sedimentary characteristics of the lacustrine fans in the dalinghe oil bed of Liaohe Basin[J].Acta Sedimentologica Sinica,1985,3(4):83-94]
9雷怀玉,邹伟宏,王连军,等.岔西地区浊积岩的发现及其油气勘探意义[J].沉积学报,1999,17(1):89-94[Lei Huanyu,Zou Weihong,Wang Lianjun,et al.The turbidite found in Chaxi area and its importance for exploration petroleum[J].Acta Sedimentologica Sini-ca,1999,17(1):89-94]
10高永进,邱桂强,陈东霞,等.牛庄洼陷岩性油藏含油气性及主控因素[J].石油与天然气地质,2004,25(3):284-287[Gao Yongjin,Qiu Guiqiang,Chen Dongxia,et al.Oil/gas shows in lithologic reser-voirs in Niuzhuang Sag and their main controlling factors[J].Oil&Gas Geology,2004,25(3):284-287]
11孟万斌,张善文,田波,等.沾化凹陷五号桩地区沙河街组三段浊流沉积特征及储集性能[J].石油与天然地质,2007,28(4):504-510[Meng Wanbin,Zhang Shenwen,Tian Bo,et al.Depositional characteristics and reservoir Properties of Turbidites in the3rd member of Shahejie Formation in Wuhaozhuang area,eastern Zhanhua Depres-sion[J].Oil&Gas Geology,2007,28(4):504-510]
12刘企英.利用地震信息进行油气预测[M].北京:石油工业出版社,1994:9-11[[Liu Qiying.Oil and Gas Prediction Via Seismic In-formation[M].Beijing:Petroleum Industry Press,1994:9-11]
13江德昕,杨惠秋.珠江口盆地早第三纪油源岩形成环境[J].沉积学报,2000,18(3):469-474[Jiang Dexin,Yang Huiqiu.Original en-vironment of Eogene petroleum souce rocks in the Pearl River Mouth Basin[J].Acta Sedimentologica Sinica,2000,18(3):469-474]
14蒋仲雄,曾麟,李明兴.中国油气区第三系(ⅤⅢ)南海北部大陆架油气区分册[M].北京:石油工业出版社,1994:1-145[Jiang Zhongxiong,Zeng Ling,Ling Mingxing.Tertiary in China Petroleum Province(ⅤⅢ)the Fascicle of Continental Shelf Petroleum Province in the South China Sea[M].Beijing:Petroleum Industry Press,1994:1-145]
15黄正吉.珠江口盆地陆相烃源岩与油气生成[J].中国海上油气(地质),1998,12(4):255-261[Huang Zhengji.Nonmarine sourcer-ock and peteoleum formation of Pearl River Mouth Basin[J].China Offshore Oil and Gas(Geology),1998,12(4):255-261]
2黄丽芬.层序地层学在陆相沉积凹陷分析中的应用——以珠江口盆地恩平凹陷为例[J].中国海上油气(地质),1999,13(3):159-168[Huang Lifen.The application of sequence seratigraphy for analysis in nonmarine depression:with example of Enping Sag,Pearl River Mouth Basin[J].China Offshore Oil and Gas(Geology),1999,13(3):159-168]
3钟建强.珠江口盆地构造特征及盆地演化[J].海洋湖沼通报,1994,1:1-8[Zhong Jianqiang.Characteristics of geology structure and basin evolution in Pearl River Mouth Basin[J].Transactions of Ocean-ology and Limnology,1994,1:1-8]
4邵磊,雷永昌,庞雄,等.珠江口盆地构造演化及对沉积环境的控制作用[J].同济大学学报(自然科学版),2005,33(9):1178-1181[Shao Lei,Lei Yongchang,Pang Xiong,et al.Tectonic evolution and controlling for sedimentary environment in Pearl River Mouth Basin[J].Journal of TongJi University(Natural Science),2005,33(9):1178-1181]
5丁原章.珠江口盆地及邻近地区的活动断裂与地震活动[J].中国地震,1994,10(4):307-319[Ding Yuanzhang.The active faults and the seismic activity in the Pearl River Mouth Basin and its vicinity areas[J].Earthquake Research in China,1994,10(4):307-319]
6吴崇筠.对国外浊流沉积和扇三角洲沉积研究的评述[M].北京:石油工业出版社,1986:1-19[Wu Chongyun.Comment on the Study on the Deposition of Turbidity Currents and Fan Delta Deposits Abroad[M].Beijing:Petroleum Industry Press,1986:1-19]
7赖婉琦,顾家裕.渤海湾含油气盆地中的浊积岩[J].沉积学报,1980,(17):799-801[Lai Wanqi,Gu Jiayu.Turbidity fan in the oil and gas bearing basin in Bohai Bay[J].Acta Sedimentologica Sinica,1980,(17):799-801]
8高延新,吴崇筠,庞增福,等.辽河盆地大湾河油层湖底扇沉积特征[J].沉积学报,1985,3(4):83-94[Gao Yanxin,Wu Chongyun,Pang Zengfu,et al.The sedimentary characteristics of the lacustrine fans in the dalinghe oil bed of Liaohe Basin[J].Acta Sedimentologica Sinica,1985,3(4):83-94]
9雷怀玉,邹伟宏,王连军,等.岔西地区浊积岩的发现及其油气勘探意义[J].沉积学报,1999,17(1):89-94[Lei Huanyu,Zou Weihong,Wang Lianjun,et al.The turbidite found in Chaxi area and its importance for exploration petroleum[J].Acta Sedimentologica Sini-ca,1999,17(1):89-94]
10高永进,邱桂强,陈东霞,等.牛庄洼陷岩性油藏含油气性及主控因素[J].石油与天然气地质,2004,25(3):284-287[Gao Yongjin,Qiu Guiqiang,Chen Dongxia,et al.Oil/gas shows in lithologic reser-voirs in Niuzhuang Sag and their main controlling factors[J].Oil&Gas Geology,2004,25(3):284-287]
11孟万斌,张善文,田波,等.沾化凹陷五号桩地区沙河街组三段浊流沉积特征及储集性能[J].石油与天然地质,2007,28(4):504-510[Meng Wanbin,Zhang Shenwen,Tian Bo,et al.Depositional characteristics and reservoir Properties of Turbidites in the3rd member of Shahejie Formation in Wuhaozhuang area,eastern Zhanhua Depres-sion[J].Oil&Gas Geology,2007,28(4):504-510]
12刘企英.利用地震信息进行油气预测[M].北京:石油工业出版社,1994:9-11[[Liu Qiying.Oil and Gas Prediction Via Seismic In-formation[M].Beijing:Petroleum Industry Press,1994:9-11]
13江德昕,杨惠秋.珠江口盆地早第三纪油源岩形成环境[J].沉积学报,2000,18(3):469-474[Jiang Dexin,Yang Huiqiu.Original en-vironment of Eogene petroleum souce rocks in the Pearl River Mouth Basin[J].Acta Sedimentologica Sinica,2000,18(3):469-474]
14蒋仲雄,曾麟,李明兴.中国油气区第三系(ⅤⅢ)南海北部大陆架油气区分册[M].北京:石油工业出版社,1994:1-145[Jiang Zhongxiong,Zeng Ling,Ling Mingxing.Tertiary in China Petroleum Province(ⅤⅢ)the Fascicle of Continental Shelf Petroleum Province in the South China Sea[M].Beijing:Petroleum Industry Press,1994:1-145]
15黄正吉.珠江口盆地陆相烃源岩与油气生成[J].中国海上油气(地质),1998,12(4):255-261[Huang Zhengji.Nonmarine sourcer-ock and peteoleum formation of Pearl River Mouth Basin[J].China Offshore Oil and Gas(Geology),1998,12(4):255-261]
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