四川盆地下寒武统龙王庙组颗粒滩特征及分布规律
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摘要
四川盆地龙王庙组颗粒滩相沉积具有良好的天然气勘探潜力。利用盆地露头、岩心和薄片资料,结合地震解释,明确了颗粒滩相由砂屑白云岩、鲕粒白云岩、晶粒白云岩和斑状白云岩组成。颗粒滩相发育滩主体、滩翼和滩坪等微相,储层主要分布于滩主体微相。颗粒滩包含多期向上变浅的高频旋回,每期滩体厚度达2~20 m,宽0.9~1.5 km,多期滩体的叠置可形成累厚18~55 m、宽7~8 km、延伸长达百余千米的滩带;滩带主要发育在台隆区相对高部位,总体上环绕澙湖展布,受古构造和海平面变化的双重控制。这一认识有利于盆地龙王庙组滩体的预测,并有助于提高钻探成功率。
The Lower Cambrian Longwangmiao grain beach sediments are of good potential of gas exploration in Sichuan basin.Based on the data from outcrops,cores and thin sections,and combined with the seismic interpretation,it is shown that the grain beach facies is composed of doloarenite,oolitic dolostone,crystalline grain dolostone and porphyritic dolostone in lithology.The grain beach facies includes three microfacies:the beach body,bank wings and beach flats microfacies.The reservoir mainly consists of the bank body microfacies.Grain beach contains multiple frequencies of shallowing-upward cycles.Each frequency of beach body is 2~20m in thickness and 0.9~1.5km in width.Multiphase beach bodies are superimposed to form a 18~55m thick,7~8km wide and hundreds km long beach belt.The beach belt mainly develops in upheaval areas of the platform and distributes around the lagoon,which is controlled by ancient structures and sea-level changes.This viewpoint is useful to predicting the location of the Longwangmiao grain beach and helpful to improving the success rate of drills.
The Lower Cambrian Longwangmiao grain beach sediments are of good potential of gas exploration in Sichuan basin.Based on the data from outcrops,cores and thin sections,and combined with the seismic interpretation,it is shown that the grain beach facies is composed of doloarenite,oolitic dolostone,crystalline grain dolostone and porphyritic dolostone in lithology.The grain beach facies includes three microfacies:the beach body,bank wings and beach flats microfacies.The reservoir mainly consists of the bank body microfacies.Grain beach contains multiple frequencies of shallowing-upward cycles.Each frequency of beach body is 2~20m in thickness and 0.9~1.5km in width.Multiphase beach bodies are superimposed to form a 18~55m thick,7~8km wide and hundreds km long beach belt.The beach belt mainly develops in upheaval areas of the platform and distributes around the lagoon,which is controlled by ancient structures and sea-level changes.This viewpoint is useful to predicting the location of the Longwangmiao grain beach and helpful to improving the success rate of drills.
引文
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[14]周进高,邓红婴,范国章,等.塔中Ⅰ号断裂带奥陶系良里塔格组礁滩储集体模式与预测[J].海相油气地质,2008,13(3):17-23.
[15]陈小炜,牟传龙,葛祥英,等.华北地区寒武系第三统鲕粒滩的展布特征及其控制因素[J].石油天然气学报,2012,34(11):8-15.
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[2]汪泽成,赵文智,张林,等.四川盆地构造层序与天然气勘探[M].北京:石油工业出版社,2002.
[3]徐世琦,洪海涛,师晓蓉.乐山—龙女寺古隆起与下古生界含油气性的关系探讨[J].天然气勘探与开发,2002,25(3):10-16.
[4]宋文海.乐山—龙女寺古隆起大中型气田成藏条件研究[J].天然气工业,1996,16(增刊):12-26.
[5]黄文明,刘树根,张长俊,等.四川盆地寒武系储层特征及优质储层形成机理[J].石油与天然气地质,2009,30(5):566-575.
[6]黄文明,刘树根,王国芝,等.四川盆地下古生界油气地质条件及气藏特征[J].天然气地球科学,2011,22(3):466-475.
[7]刘树根,马永生,蔡勋育.四川盆地震旦系—下古生界天然气成藏过程和特征[J].成都理工大学学报:自然科学版,2009,36(4):345-352.
[8]李晓清,汪泽成,张兴为,等.四川盆地古隆起特征及对天然气的控制作用[J].石油与天然气地质,2001,22(4):347-351.
[9]罗志立,刘顺,徐世琦,等.四川盆地震旦系含气层中有利勘探区块的选择[J].石油学报,1998,19(4):1-7.
[10]周进高,郭庆新,沈安江,等.四川盆地北部孤立台地边缘飞仙关组鲕滩储层特征及成因[J].海相油气地质,2012,17(2):57-62.
[11]蒋志斌,王兴志,张帆,等.四川盆地北部长兴组—飞仙关组礁、滩分布及其控制因素[J].中国地质,2008,35(5):940-949.
[12]曾德铭,石新,王兴志,等.川西北地区下二叠统栖霞组滩相储层特征及其分布[J].天然气工业,2010,30(12):25-29.
[13]王兴志,王振宇,马青,等.塔里木盆地中部生物屑灰岩段滩体特征及储集性[J].石油与天然气地质,2002,23(1):58-63.
[14]周进高,邓红婴,范国章,等.塔中Ⅰ号断裂带奥陶系良里塔格组礁滩储集体模式与预测[J].海相油气地质,2008,13(3):17-23.
[15]陈小炜,牟传龙,葛祥英,等.华北地区寒武系第三统鲕粒滩的展布特征及其控制因素[J].石油天然气学报,2012,34(11):8-15.
[16]万晶,孙玉朋.颗粒滩相碳酸盐岩储层发育演化的主控因素[J].断块油气田,2009,16(4):60-62.
[17]Loean J P,Purser B H.Distribution and ultrastructure of Holocene ooids in the Persian Gulf[M]//Purser B H.The Persian Gulf,Holocene carbonate sedimentation and diagenesis in a shallow epicontinental sea.SpringerVerlay,1973:279-328.
[18]李凌,谭秀成,夏吉文,等.海平面升降对威远寒武系滩相储层的影响[J].天然气工业,2008,28(4):19-22.
[19]Halley R B,Harris P M,Hine A C.Bank marginal environment[J]//Scholle P A,Bebout D G,Moore C H.Carbonate depositional environments.AAPG memoir,1983,33(1):463-506.
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