方正断陷断盖配置及其对油气成藏与分布的控制作用

为了研究方正断陷油气成藏规律,在方正断陷盖层和断裂发育及分布的基础上,采用断盖匹配及其与油气匹配关系的叠合分析的研究方法,对方正断陷断盖配置类型及对油气成藏与分布的控制作用进行了研究。结果表明:方正断陷断盖配置主要有完全错开和未完全错开2种类型,前者主要表现在东部新安村+乌云组和西部部分新安村+乌云组顶部泥岩盖层与断裂的配置关系上;后者主要表现在宝一段、宝二段和西部新安村+乌云组底部泥岩盖层与断裂配置关系上。断盖配置对油气成藏与分布的控制作用主要表现在3个方面:1完全错开型断盖配置油气在盖层上下分布;2未完全错开型断盖配置油气只能分布在盖层之下;3断盖配置的差异性控制着东西部油气分布层位的差异性。

Matching between faults and caprocks and its controlling to oil-gas accumulation and distribution in Fangzheng depression

To study oil-gas accumulation law, based on the study of development and distribution of caprocks and its controlling to oil-gas accumulation and distribution in Fangzheng depression were studied by the method analyzing matching between faults and caprocks and relation between it and oil-gas distribution. The result indicates that there are two types of matching between faults an caprocks which caprock is faulted fully and caprock is not faulted fully. The former is showed in Xin"ancun+Wuyun formation in the west of depression. The latter is showed in the first and secondary member of Baoquanling formation, bottom of Xin"ancun Wuyun formation. Controlling of matching between faults and caprocks is shown in following three aspects: 1.oil-gas distributes over and lower of caprock in matching between faults and caprocks which caprock is faulted fully; 2.oil-gas only distributes lower of caprock in matching between faults and caprocks which caprock is not faulted fully; 3.difference of matching between faults and caprocks controls difference of oil-gas distribution in the east and in the west of depression.