焉耆盆地博湖坳陷八道湾组底部层序(SQ1)地震相研究
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摘要
博湖坳陷是焉耆盆地的主要油气勘探区域,但长期以来,该地区都以寻找构造圈闭为主要勘探目标,随着勘探程度的加深,寻找构造油气藏的难度不断加大,为进一步打开油气勘探局面,故迫切需要寻找隐蔽圈闭。为此,通过对八道湾组底部层序(SQ1)开展地震相-沉积相分析,结合已有钻井岩性资料,预测油气富集相带。研究表明,研究区主要存在山前复合扇体、主水道、扇三角洲;废弃的三角洲平原、沼泽、三角洲平原;强制水退、低位三角洲;滨浅湖、半深湖等相带。强制水退期间沉积的倾向湖盆的前积砂泥互层,极有可能发育孤立砂体,形成隐蔽的岩性圈闭,是最为有利的勘探目标。
Bohu depression is the main hydrocarbon exploration area in the Yanqi basin.However,for a long time,structural traps are searched as its main exploration target in this area.With the further exploration,finding structural reservoirs is becomong harder and harder.In order to breakout the situation of hydrocarbon exploration,it is urgent to find the subtle traps.according to the seismic internal reflection and external geometry,continuity,amplitude,frequency and other seismic facies parameter,7 seismic facies are identified in the study area.Combined the logging data and sedimentary tectonic background,lithofacies distribution charts of SQ1 sequence are compiled.Piedmont complex fans,main stream channels,fan-deltas,abandoned delta plain,swamp,and delta plain,forced regression,lowstand delta,shore-shallow lake facies develop in the study area.Progradation sand-mud alternations which trend to the lake basin during the force regression,probably develop separated sand-body,and form a concealed lithologic trap.This is the best exploration target.
Bohu depression is the main hydrocarbon exploration area in the Yanqi basin.However,for a long time,structural traps are searched as its main exploration target in this area.With the further exploration,finding structural reservoirs is becomong harder and harder.In order to breakout the situation of hydrocarbon exploration,it is urgent to find the subtle traps.according to the seismic internal reflection and external geometry,continuity,amplitude,frequency and other seismic facies parameter,7 seismic facies are identified in the study area.Combined the logging data and sedimentary tectonic background,lithofacies distribution charts of SQ1 sequence are compiled.Piedmont complex fans,main stream channels,fan-deltas,abandoned delta plain,swamp,and delta plain,forced regression,lowstand delta,shore-shallow lake facies develop in the study area.Progradation sand-mud alternations which trend to the lake basin during the force regression,probably develop separated sand-body,and form a concealed lithologic trap.This is the best exploration target.
引文
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[10]时志强,赵冠军.焉耆盆地博湖坳陷含油气系统及勘探方向[J].天然气工业,2001,21(5):12-14.
[11]张明学,刘淑芬.乌尔逊凹陷南部大磨拐河组地震相[J].物探与化探,2009,33(6):638-641.
[12]张虹,刘殊.再论川西坳陷须家河组二段气藏地震相特征[J].石油物探,2010,48(3):268-279.
[2]王华,赵忠新,陆永潮,等.焉耆盆地博湖坳陷侏罗系地层格架及沉积学特征[J].中南大学学报(自然科学版),2006,37(1):42-46.
[3]郭召杰,张志诚,钱祥麟.塔里木东北缘的一个早-中侏罗世拉分盆地-焉耆盆地[J].地学前缘,1995,2(4):255-256.
[4]袁正文.焉耆盆地构造演化分析[J].江汉石油学院学报,2003,25(4):33-35.
[5]陈文礼.焉耆改造型盆地特征及其油气勘探方向预测[J].江汉石油学院学报,2003,25(2):4-5.
[6]陈祥,张育民,程克明,等.焉耆盆地侏罗纪煤系源岩纤维组分组合与生油潜力[J].地球科学-中国地质大学学报,2005,30(3):337-342.
[7]马强,姚亚明,金维平,等.焉耆盆地含油气系统[J].新疆石油地质,2008,29(2):172-175.
[8]吴富强,王敏,秦伟军,等.焉耆盆地三叠系—侏罗系含油气系统[J].石油勘探与开发,1999,26(5):5-8.
[9]姚亚明,吴烨,李洪,等.焉耆盆地博湖坳陷油气形成条件分析[J].西北地质,2006,39(4):74-83.
[10]时志强,赵冠军.焉耆盆地博湖坳陷含油气系统及勘探方向[J].天然气工业,2001,21(5):12-14.
[11]张明学,刘淑芬.乌尔逊凹陷南部大磨拐河组地震相[J].物探与化探,2009,33(6):638-641.
[12]张虹,刘殊.再论川西坳陷须家河组二段气藏地震相特征[J].石油物探,2010,48(3):268-279.
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