四川盆地建南地区二叠系长兴组生物礁滩储集层预测
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摘要
四川盆地建南地区长兴组生物礁滩储集层分布受控于开江—梁平盆地的展布,但对于该区盆地的延伸范围一直存在多种观点。作者通过深入研究礁滩在地震剖面上的响应特征,主要利用钻井资料并结合正演模型,发现研究区内茅口组四段顶部灰岩厚度与TP2地震反射层形态有关。由于在茅口组末期研究区内存在东吴抬升运动,古地形高地遭受强烈剥蚀,茅口组四段顶部灰岩残余厚度小,对应的地震剖面出现"双强"反射特征;反之,古地形低处遭受剥蚀少,茅口组四段顶部灰岩残余厚度大,对应的地震剖面出现"三强"反射特征。利用此特点建立古地形和地震属性之间的关系,通过分析发现茅口组沉积末期研究区内呈现出西低东高的构造格局。由于长兴初期开始受构造运动影响,开江—梁平盆地逐步拉张,到长二末期形成了新的古地貌。利用地层切片技术、野外露头资料、薄片及钻井资料分析,认为盆地从中间穿过研究区。结合构造运动及现有资料证据,综合物探和地质资料提出了一种盆地分布范围的新观点,并确定了适合生物礁滩发育的有利区带。
The distribution of reef and bank reservoir of the Changxing Formation in Jiannan area is controlled by the distribution of the Kaijiang-Liangping Basin.The response characteristics on seismic profile of the reef and bank were studied.Mainly on the basis of drilling well data and forward simulation model,the research results indicate that the thickness of limestone of the Member 4 of Maokou Formation is related with the shape of TP2 seismic reflection interval.During the late period of Maokou Formation,the Dongwu tectonic movement occurred in the study area which led to the intensive stratigraphic exposion.The remnant thickness of limestone of the top Member 4 of Maokou Formation was thin and led to the"two intensive"reflection on seismic profile.In contrast,less exposion occurred at lower paleotopographic unit.Thus the remnant thickness of limestone of the Member 4 of Maokou Formation was thick and the corresponding seismic reflection is characterized by"three intensive"reflection.The relationship between paleotopography and seismic attributes was established using this characteristic.The analyses show that the tectonic framework is characterized by"lower in west and higher in east"in the late depositional period of the Maokou Formation.Due to the influence of tectonic movement in the early period of Changxing Formation,the Kaijiang-Liangping Basin gradually expanded and formed a new paleotopography in the late depositional period of submember 2 of Changxing Formation.By the analyses of stratigraphic slice data,outcrop and drilling well data,the authors propose that the basin crossed the study area.A new viewpoint about the distribution of the basin has been proposed and the profitable developing area of reef and bank has been identified combining with tectonic movement and current data and the comprehensive geophysical and geological data.
The distribution of reef and bank reservoir of the Changxing Formation in Jiannan area is controlled by the distribution of the Kaijiang-Liangping Basin.The response characteristics on seismic profile of the reef and bank were studied.Mainly on the basis of drilling well data and forward simulation model,the research results indicate that the thickness of limestone of the Member 4 of Maokou Formation is related with the shape of TP2 seismic reflection interval.During the late period of Maokou Formation,the Dongwu tectonic movement occurred in the study area which led to the intensive stratigraphic exposion.The remnant thickness of limestone of the top Member 4 of Maokou Formation was thin and led to the"two intensive"reflection on seismic profile.In contrast,less exposion occurred at lower paleotopographic unit.Thus the remnant thickness of limestone of the Member 4 of Maokou Formation was thick and the corresponding seismic reflection is characterized by"three intensive"reflection.The relationship between paleotopography and seismic attributes was established using this characteristic.The analyses show that the tectonic framework is characterized by"lower in west and higher in east"in the late depositional period of the Maokou Formation.Due to the influence of tectonic movement in the early period of Changxing Formation,the Kaijiang-Liangping Basin gradually expanded and formed a new paleotopography in the late depositional period of submember 2 of Changxing Formation.By the analyses of stratigraphic slice data,outcrop and drilling well data,the authors propose that the basin crossed the study area.A new viewpoint about the distribution of the basin has been proposed and the profitable developing area of reef and bank has been identified combining with tectonic movement and current data and the comprehensive geophysical and geological data.
引文
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范嘉松,吴亚生.2002.川东二叠纪生物礁再认识[J].石油与天然气地质,23(1):12-18.
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梁西文,郑荣才,张涛,等.2006.建南构造晚二叠世长兴期点礁和滩的高精度层序地层与储集层评价[J].成都理工大学学报(自然科学版),33(4):407-413.
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马永生,梅冥相,陈小兵,等.1999.碳酸盐岩储集层沉积学[M].北京:地质出版社.
马永生,牟传龙,郭旭升,等.2006.川东北地区长兴组沉积特征与沉积格局[J].地质论评,52(1):25-29.
马永生,牟传龙,谈钦银,等.2006.关于开江—梁平海槽的认识[J].石油与天然气地质,27(3):327-331.
牟传龙,谭钦银,余谦,等.2004.川东北地区上二叠统长兴组生物礁组成及成礁模式[J].沉积与特提斯地质,24(3):65-71.
彭勇,肖姹莉.200l.川开江黄龙场、渡口河地区地震储集层预测研究[J].天然气勘探与开发,24(1):1-8.
蒲勇.2004.地震属性技术在碳酸盐岩鲕滩储集层预测中的应用[J].石油物探,43(增刊):63-68.
汪晴川,李瑞,蒲平文,等.2008.川东长兴组生物礁分布地震识别技术研究[J].物探化探计算技术,30(4):282-287.
王一刚,张静,杨雨,等.1997.四川盆地东部上二叠统长兴组生物礁气藏形成机理[J].海相油气地质,5(1):145-152.
王一刚,文应初,张帆,等.1998.川东地区上二叠统长兴组生物礁分布规律[J].天然气工业,18(6):10-15.
陈太源.1989.九龙山构造南侧存在长兴组台缘礁的探讨[J].天然气工业,9(1):6-10.
陈遵德.1998.地震属性优化方法[M].北京:石油工业出版社.
范嘉松,吴亚生.2002.川东二叠纪生物礁再认识[J].石油与天然气地质,23(1):12-18.
梁华,罗蓉.1999.利用地震资料研究川东上二叠统生物礁分布规律[J].天然气工业,19(5):91-96.
梁西文,郑荣才,张涛,等.2006.建南构造晚二叠世长兴期点礁和滩的高精度层序地层与储集层评价[J].成都理工大学学报(自然科学版),33(4):407-413.
刘划一,王一刚,杨雨,等.1999.川东上二叠统生物礁气藏多元信息综合预测方法研究[J].天然气工业,19(4):13-18.
刘殊,范菊芬,曲国胜,等.2006.气烟囱效应——礁滩相岩性气藏的典型地震响应特征[J].天然气工业,26(11):52-56.
马永生,梅冥相,陈小兵,等.1999.碳酸盐岩储集层沉积学[M].北京:地质出版社.
马永生,牟传龙,郭旭升,等.2006.川东北地区长兴组沉积特征与沉积格局[J].地质论评,52(1):25-29.
马永生,牟传龙,谈钦银,等.2006.关于开江—梁平海槽的认识[J].石油与天然气地质,27(3):327-331.
牟传龙,谭钦银,余谦,等.2004.川东北地区上二叠统长兴组生物礁组成及成礁模式[J].沉积与特提斯地质,24(3):65-71.
彭勇,肖姹莉.200l.川开江黄龙场、渡口河地区地震储集层预测研究[J].天然气勘探与开发,24(1):1-8.
蒲勇.2004.地震属性技术在碳酸盐岩鲕滩储集层预测中的应用[J].石油物探,43(增刊):63-68.
汪晴川,李瑞,蒲平文,等.2008.川东长兴组生物礁分布地震识别技术研究[J].物探化探计算技术,30(4):282-287.
王一刚,张静,杨雨,等.1997.四川盆地东部上二叠统长兴组生物礁气藏形成机理[J].海相油气地质,5(1):145-152.
王一刚,文应初,张帆,等.1998.川东地区上二叠统长兴组生物礁分布规律[J].天然气工业,18(6):10-15.
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