十万大山盆地下二叠统生物礁古油藏剖析及其地下隐伏礁的分布预测

广西宁明亭亮茅口组生物礁古油藏为十万大山盆地已暴露破坏的礁石油藏之一。亭亮生物礁为大新（崇左）台地边缘发展起来的大型堤礁。礁的主要造架生物为海绵、水螅、苔藓虫及藻类等，其沉积组合具礁基、礁核、礁盖、礁间滩及礁前等亚相。该石油藏的含沥青储层主要位于礁体的上部和顶部，含沥青礁灰岩厚达９８ｍ以上。礁储层次生溶孔的形成与分布主要受控于深埋有机溶蚀作用，同时在空间上还与礁顶部古风化壳和不整合面密切相关。烃源

Analysis of a Destroyed Reef Oil Pool of Lower Permian in Shiwandashan Basin and Prediction of Hidden Reef Distribution

A destroyed reef oil pool of Maokou Fm.located in Tingliang Ningming Guangxt is one of exposed and destroyed reef oil pools in Shiwandashan Basin.Tingliang reef is a large scale of barrier reef developed from Daxin platform margin.The main reef-building organisms are Porifera, Hydrozoa,bryazoom and algae etc.The bitumen-bearing reservoir in this destroyed oil pool lies at top and upper part of the reef.The thickness of the bitumen-bearing limestone may be over 98m.The overlying Middle-Lower Triassic shale as a resional cap rock is very thick.There are 31 Ienticular anomaly bodies(reefs),including 11 typical ones,could be recognized in decades of seismic lines taken from the northeast of the basin,which is overlapping of 9 anomaly bodies(reefs)identified in MT section.Both the outcrop reefs and possible hidden reefs lie at the same part of lithofacies paleogeography,which shows that a platform marginal hidden-reef developing zone,predominant Maokou Fm.,may occur from Shangying to Taian of the basin.The destroyed reef oil pool located in the northern part of the basin as well as oil-gas shows up to 150km long indicate that more attention has to be paid to the hidden-reef distribution and its hydrocarbon potential, which may be a new area of oil-gas exploration in the basin.