泌阳凹陷深层系油气成藏样式

RESERVOIRING PATTERNS OF OIL AND GAS IN THE DEEP LAYER OF BIYANG DEPRESSION

泌阳凹陷深层系油气藏主要发育于该凹陷东南部深凹区的核桃园组三段下亚段 ,其成藏样式可分为安棚 -赵凹型和下二门型两种主要类型。安棚 -赵凹型油气藏样式的最大特点是油气具 3期充注过程 ,且以中、晚期为主成藏期。下二门型油气藏的形成经历了形成破坏再形成的过程 ,核桃园组一段和廖庄组沉积时期形成早期背斜油气藏 ,但在廖庄组沉积末期 ,因构造运动的影响油气藏遭受改造或破坏 ,至上寺组沉积末期 ,形成现今油气藏格局。除上述两种主要样式外 。

The deep oil and gas pools develop mainly in the lower third member of Hetaoyuan Formation in the deep sag in southeastern Biyang Depression. There are two reservoiring patterns: Anpeng-Zhaowa type and Xia'ermen type. The former is characterized by three charging periods and the reservoirs have mainly been formed in the middle and late stages. The latter type of oil and gas pools have undergone the processes of formation-destruction-reformation. The early anticlinal oil and gas pools were formed during the deposition of the first member of Hetaoyuan formation and Liaozhuang formation, the pattern of the present oil and gas pools was not formed till the later stage of deposition of Shangsi formation, due to the reformation and destruction,caused by the tectonic movement in the later stage of Liaozhuang formation deposition. Except the above-mentioned two reservoiring patterns, probably there are also lithologic oil & gas pools in lenticular sandstones, as well as deep basin reservoirs.