鄂尔多斯盆地西南部长6油层组浊流沉积及其分布特征
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摘要
在鄂尔多斯盆地西南部长6油层组的半深湖-深湖亚相中发育有大量的浊积岩,构成该地区主要储层类型,成为油气勘探的重要区域。其以薄互层的形式出现,具有分布不稳定、隐蔽性强的特点。文章从沉积构造、砂体结构、电性和地震反射等方面总结了浊流沉积的特征,采用地质、测井与地震相结合的技术手段,预测了长6油层组浊积砂体的平面分布特征。研究表明,长6油层组浊积砂体的空间展布形态及其发育规模存在2个明显区带:①华庆地区白豹—华池一带的缓坡型浊积岩,平面呈规模较大的层状体;②正宁—合水地区陡坡型浊积岩,平面呈规模较小的朵状、扇状。
Turbidite is widely developed in the bathal-abysmal lake subfacies of Chang 6 oil reservoir formation in the southwestern ordos Basin.The trubidite constitutes main reservoirs in this area and is the important oil-gas exploration target.it is characterized by thin interbeds and irregular distribution thus tends to be disguised.This paper summarizes characteristics of the turbitite with respect of its sedimentary structure,structure of sand body,electric property and seismic reflection.Data of geology,logging and seismic survey are combined to predict plan distribution of the turbitite.Results show two obvious turbidite zones varied in spacial extension and and size of sand body:①Baibao-Huachi zone in Huaqing area whose turbitite was deposited on gentle slope with larger size of layeroid sand body in plan;②Zhengning-hesui zone whose turbidite deposited on steep slope with smaller size of sand body in flower and fan shape in plan.
Turbidite is widely developed in the bathal-abysmal lake subfacies of Chang 6 oil reservoir formation in the southwestern ordos Basin.The trubidite constitutes main reservoirs in this area and is the important oil-gas exploration target.it is characterized by thin interbeds and irregular distribution thus tends to be disguised.This paper summarizes characteristics of the turbitite with respect of its sedimentary structure,structure of sand body,electric property and seismic reflection.Data of geology,logging and seismic survey are combined to predict plan distribution of the turbitite.Results show two obvious turbidite zones varied in spacial extension and and size of sand body:①Baibao-Huachi zone in Huaqing area whose turbitite was deposited on gentle slope with larger size of layeroid sand body in plan;②Zhengning-hesui zone whose turbidite deposited on steep slope with smaller size of sand body in flower and fan shape in plan.
引文
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[3]倪新锋,陈洪德,田景春,等.短期基准面旋回充填样式与储层宏观非均质性关系[J].油气地质与采收率,2007,14(2):57-60.
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[5]史成恩,罗晓容,万晓龙,等.甘肃陇东地区上三叠统延长组长6、长8沉积特征及低渗响应[J].地质力学学报,2006,12(4):454-460.
[6]陈飞,罗平,张兴阳,等.鄂尔多斯盆地东缘上三叠统延长组砂体结构与层序地层学研究[J].地学前缘,2010,17(1):330-338.
[7]李文厚,庞军刚,曹红霞,等.鄂尔多斯盆地晚三叠世延长期沉积体系及岩相古地理演化[J].西北大学学报,2009,39(3):501-506.
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[9]陈广坡,王天奇,李林波,等.箕状断陷湖盆湖底扇特征及油气勘探[J].石油勘探与开发,2010,37(1):63-69.
[2]赵俊兴,李凤杰,申晓莉,等.鄂尔多斯盆地南部长6和长7油层浊流事件的沉积特征及发育模式[J].石油学报,2008,29(3):389-394.
[3]倪新锋,陈洪德,田景春,等.短期基准面旋回充填样式与储层宏观非均质性关系[J].油气地质与采收率,2007,14(2):57-60.
[4]傅强,吕苗苗,刘永斗.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义[J].沉积学报,2008,26(2):186-191.
[5]史成恩,罗晓容,万晓龙,等.甘肃陇东地区上三叠统延长组长6、长8沉积特征及低渗响应[J].地质力学学报,2006,12(4):454-460.
[6]陈飞,罗平,张兴阳,等.鄂尔多斯盆地东缘上三叠统延长组砂体结构与层序地层学研究[J].地学前缘,2010,17(1):330-338.
[7]李文厚,庞军刚,曹红霞,等.鄂尔多斯盆地晚三叠世延长期沉积体系及岩相古地理演化[J].西北大学学报,2009,39(3):501-506.
[8]赵俊兴,吕强,李凤杰,等.鄂尔多斯盆地南部延长组长6时期物源状况分析[J].沉积学报,2008,26(4):610-616.
[9]陈广坡,王天奇,李林波,等.箕状断陷湖盆湖底扇特征及油气勘探[J].石油勘探与开发,2010,37(1):63-69.
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