塔中地区柯坪塔格组储层致密化成因
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摘要
针对塔中地区柯坪塔格组储层致密、非均质性强的特点,利用储层微观观察和测试分析手段,研究了储层成岩作用及其对储集空间的影响,结合孔隙定量化计算建立储层成岩—成孔演化模型。研究认为,该区储层存在二次致密化作用,其中中成岩B阶段晚期的碳酸盐岩胶结作用是储层剩余原生孔和次生孔损失的重要原因。发生在中成岩B期酸性和碱性叠加溶蚀作用促进了次生孔隙形成,是该区有效储层形成的重要原因。研究结果为该区柯坪塔格组储层致密化及非均质成因研究提供依据。
Kepingtage reservoirs in Tazhong are featured by tightness and strong heterogeneity. Reservoir microscopic observation and test are used to study the diagenesis and its effect on reservoir space. The quantitative pore calculation is taken into account to establish reservoir diagenesis-pore evolution model. Study illustrates that there is a redensification process in the reservoirs. The loss of remaining primary pores and secondary pores mainly result from the carbonate cementation in the late middle-diagenesis stage B. The study could provide a basis for the genesis of densification and heterogeneity in Kepingtage reservoirs.
Kepingtage reservoirs in Tazhong are featured by tightness and strong heterogeneity. Reservoir microscopic observation and test are used to study the diagenesis and its effect on reservoir space. The quantitative pore calculation is taken into account to establish reservoir diagenesis-pore evolution model. Study illustrates that there is a redensification process in the reservoirs. The loss of remaining primary pores and secondary pores mainly result from the carbonate cementation in the late middle-diagenesis stage B. The study could provide a basis for the genesis of densification and heterogeneity in Kepingtage reservoirs.
引文
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[2]魏福军,等.塔里木盆地塔中地区输导体系及成藏效应[J].石油与天然气地质,2007,28(2):266-273.
[3]孙乃泉,等.塔里木盆地顺9井区柯坪塔格组下段沉积微相与储层展布[J].吉林大学学报(地球科学版),2013,43(6):1716-1725.
[4]郭少斌,洪克岩.塔里木盆地志留系—泥盆系层序地层及有利储层分布[J].石油学报,2007,28(3):44-50.
[5]EHRENBERG S N,NADEAU P A.Megascale view of reservoir quality in producing sandstones from the offshore Gulf of Mexico[J].AAPG Bulletin,2008,92(2):145-164.
[6]李玉胜,谢传礼,邓兴梁,等.英买34、35井区志留系柯坪塔格组储层特征及其控制因素[J].中国地质,2009,36(5):1087-1098.
[7]刘娅铭.塔里木盆地志留—泥盆系碎屑岩储层特征研究[D].北京:中国地质大学,2006.
[8]徐波,孙卫.姬塬油田长4+5砂岩储层孔隙类型与成岩作用[J].吉林大学学报(地球科学版),2008,38(6):953-958.
[9]张金亮,张鹏辉,谢俊,等.碎屑岩储集层成岩作用研究进展与展望[J].地球科学进展,2013,28(9):957-967.