川东北元坝地区致密砂岩油气地质特征
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摘要
随着川东北油气勘探的迅速发展,中浅层油气藏逐渐成为油气增储上产的重要接替阵地之一。根据钻探成果以及化验资料分析,川东北元坝地区中浅层油气藏具有低孔、低渗的特点,且横向展布范围大,有效储集层受岩性和物性的控制。同时利用测井资料和地震解释成果对该区油气藏成藏机理进一步分析,表明元坝地区中浅层油气藏为致密砂岩油气藏及其多次运移的结果,渗透率级差、孔隙连通性决定着该类型油气藏的富集规律。元坝地区致密砂岩油气藏的发现对于进一步扩大川东北油气勘探的胜利成果和建立川东北油气资源的接替阵地有着十分重要的意义。
With the fast going of oil and gas exploration in northeast Sichuan province,mid-shallow reservoirs are important for adding to reserves and boosting production.Drilling data and laboratory analysis indicate that the mid-shallow reservoirs in Yuanba area of northeast Sichuan are characterized by low porosity and low permeability,extensively distributed laterally,and are dominated by lithology and physical property.The mechanism of hydrocarbon accumulation in this area has been analyzed by using logging data and seismic interpretation results.It shows that the mid-shallow reservoirs in Yuanba area are tight sandstone reservoirs which had experienced multiple migrations;and the enrichment of oil and gas in such reservoirs are subject to permeability ratio and pore connectivity.The discovery of the tight sandstone reservoirs in Yuanba area is of important significance for further expanding oil and gas exploration and securing substitutive oil and gas resources in northeast Sichuan.
With the fast going of oil and gas exploration in northeast Sichuan province,mid-shallow reservoirs are important for adding to reserves and boosting production.Drilling data and laboratory analysis indicate that the mid-shallow reservoirs in Yuanba area of northeast Sichuan are characterized by low porosity and low permeability,extensively distributed laterally,and are dominated by lithology and physical property.The mechanism of hydrocarbon accumulation in this area has been analyzed by using logging data and seismic interpretation results.It shows that the mid-shallow reservoirs in Yuanba area are tight sandstone reservoirs which had experienced multiple migrations;and the enrichment of oil and gas in such reservoirs are subject to permeability ratio and pore connectivity.The discovery of the tight sandstone reservoirs in Yuanba area is of important significance for further expanding oil and gas exploration and securing substitutive oil and gas resources in northeast Sichuan.
引文
[1]李林涛,邓克,张建华.川西坳陷中段上三叠统须家河组致密气藏超压特征与组合类型划分[J].特种油气藏,2010,17(3):19-30.
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[8]邹才能,赵政璋,杨华,等.陆相湖盆深水砂质碎屑流成因机制与分布特征[J].沉积学报,2009,27(6):1065-1073.
[9]章星,杨胜来,张洁,等.致密低渗气藏启动压力梯度实验研究[J].特种油气藏,2011,18(5):103-134.
[10]蒋海军,鄢捷年.裂缝性储集层应力敏感性实验研究[J].特种油气藏,2000,7(3):39-46.
[11]刘若冰,郭彤楼,邵明莉.川东北元坝地区中浅层天然气气源及成因类型[J].天然气工业,2011,31(6):34-38.
[2]吴春萍.鄂尔多斯盆地北部上古生界致密砂岩储层测井地质评价[J].特种油气藏,2004,11(1):9-17.
[3]罗啸泉.四川盆地西部流体封存箱与天然气成藏的关系[J].特种油气藏,2005,12(6):18-21.
[4]邹才能,陶士振,朱如凯,等.“连续型”气藏及其大气区形成机制与分布——以四川盆地上三叠统须家河组煤系大气区为例[J].石油勘探与开发,2009,36(3):307-319.
[5]刘树根,曾祥亮,黄文明,等.四川盆地页岩气藏和连续型-非连续型气藏基本特征[J].成都理工大学学报:自然科学版,2009,36(6):578-592.
[6]Cao Feng,Cai Neng Zou,et al.Evidence analysis of nat-ural gas near-source migration-accumulation model inthe Sulige large gas province,Ordos basin,China[J].Acta Petrologica Sinica,2011,27(3):857-866.
[7]公言杰,邹才能,袁选俊,等.国外“连续型”油气藏研究进展[J].岩性油气藏,2009,21(4):130-134.
[8]邹才能,赵政璋,杨华,等.陆相湖盆深水砂质碎屑流成因机制与分布特征[J].沉积学报,2009,27(6):1065-1073.
[9]章星,杨胜来,张洁,等.致密低渗气藏启动压力梯度实验研究[J].特种油气藏,2011,18(5):103-134.
[10]蒋海军,鄢捷年.裂缝性储集层应力敏感性实验研究[J].特种油气藏,2000,7(3):39-46.
[11]刘若冰,郭彤楼,邵明莉.川东北元坝地区中浅层天然气气源及成因类型[J].天然气工业,2011,31(6):34-38.
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