双鱼石地区栖霞组层序地层划分及沉积相分析
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摘要
双鱼石地区勘探潜力巨大,随着勘探的深入,双探1井在栖霞组取得了重大突破,但由于对该区滩体边界刻画不够细致,从而制约了勘探效益。为了深化对沉积展布特征的认识,以层序地层学、沉积学为理论基础,结合野外露头、钻井、测井及地震资料,建立层序地层格架,并利用地震多属性分析技术对滩体边界进行刻画,进而对有利区域进行预测。研究认为:栖霞组可划分为2个三级层序和2个海泛面,各三级层序划分为海进、海退2个体系域;发育开阔台地相及台地边缘相,可分为4个亚相和3个微相;将有利区划分为三级有利区,其中以断层附近的构造高点最为有利。该结论的提出对后续工作有一定指导意义。
Shuangyushi Block has great exploration potentials. With progresses in exploration operations,breakthroughs have been achieved in Well ST-1 during penetration of the Qixia Formation. During the course,inaccurate identification of beach boundaries restricted exploration efficiencies. To highlight features in distribution of sediments,sequence stratigraphic framework was established on bases of sequence stratigraphy and sedimentary theories and with consideration to features of outcrops,drilling,logging and seismic data. At the same time,seismic multiple attribute analyses were conducted to identify favorable exploration targets. Research results show: Qixia Formation can be divided into 2 third-order sequences and 2 marine-flooding surfaces. Each third-order sequences can be further divided into two system tracts,namely transgression and regression; open-platform facies and platformmargin facies can be further divided into 4 subfacies and 3 micro-facies. Favorable zones can be classified into three categories. Among them,structural highs in vicinity of the fault can be seen as the most favorable exploration targets. Relevant research conclusions may provide necessary supports for future operations.
Shuangyushi Block has great exploration potentials. With progresses in exploration operations,breakthroughs have been achieved in Well ST-1 during penetration of the Qixia Formation. During the course,inaccurate identification of beach boundaries restricted exploration efficiencies. To highlight features in distribution of sediments,sequence stratigraphic framework was established on bases of sequence stratigraphy and sedimentary theories and with consideration to features of outcrops,drilling,logging and seismic data. At the same time,seismic multiple attribute analyses were conducted to identify favorable exploration targets. Research results show: Qixia Formation can be divided into 2 third-order sequences and 2 marine-flooding surfaces. Each third-order sequences can be further divided into two system tracts,namely transgression and regression; open-platform facies and platformmargin facies can be further divided into 4 subfacies and 3 micro-facies. Favorable zones can be classified into three categories. Among them,structural highs in vicinity of the fault can be seen as the most favorable exploration targets. Relevant research conclusions may provide necessary supports for future operations.
引文
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[3]魏国齐,杨威,朱永刚,等.川西地区中二叠统栖霞组沉积体系[J].石油与天然气地质,2010,31(4):443-448.
[4]苏旺,陈志勇,汪泽成,等.川西地区中二叠统栖霞组沉积特征[J].东北石油大学学报,2016,40(3):41-50.
[5]梁宁,郑荣才,邓吉刚,等.川西北地区中二叠统栖霞组沉积相与缓斜坡模式[J].岩性油气藏,2016,28(6):58-67.
[6]黄涵宇,何登发,李英强,等.四川盆地及邻区二叠纪梁山—栖霞组沉积盆地原型及其演化[J].岩石学报,2017,33(4):1317-1337.
[7]王鼐,魏国齐,杨威,等.川西北构造样式特征及其油气地质意义[J].中国石油勘探,2016,21(6):26-33.
[8]袁庆东,李本亮,刘海涛,等.川西北地区构造演化阶段及岩相古地理[J].大庆石油学院学报,2010,34(6):42-52.
[9]黄渊,李斌,孙健,等.四川盆地东北部龙会场—铁山地区飞仙关组沉积演化与鲕滩储层分布规律[J].东北石油大学学报,2017,41(5):12-22.
[10]刘治成,杨巍,王炜,等.四川盆地中二叠世栖霞期微生物丘及其对沉积环境的启示[J].中国地质,2015,42(4):1009-1023.
[11]宋文海.对四川盆地加里东期古隆起的新认识[J].天然气工业,1987,7(3):6-11.
[12]魏巍,陆永潮,刘中戎,等.西藏伦坡拉盆地牛堡组层序地层与沉积充填模式[J].石油实验地质,2017,39(1):32-40.
[13]凌云研究组.基本地震属性在沉积环境解释中的应用研究[J].石油地球物理勘探,2003,38(6):642-653.
[14]王东燕,彭金宁,邱岐,等.下扬子句容地区上古生界油气成藏模式及控制因素[J].石油实验地质,2017,39(5):640-646.
[15]袁浩,尹富平,杨巍,等.川西北地区下二叠统栖霞组白云岩分布与成因探讨[J].四川地质学报,2010,30(4):386-389.
[16]刘伟方,段永华,高建虎,等.利用地震属性预测碳酸盐岩储层[J].岩性油气藏,2007,19(1):101-104.
[17]尉鹏飞,张金川,隆帅,等.四川盆地及周缘地区龙马溪组页岩微观孔隙结构及其发育主控因素[J].中国石油勘探,2016,21(5):42-51.