轮南奥陶系碳酸盐岩储集体控油机理探讨

塔里木盆地轮南地区奥陶系碳酸盐岩基岩总体为非储层,有效储集体为由岩溶作用形成的次生孔、洞、缝型储集体。根据岩溶发育控制因素和岩溶期次,重点研究了轮南地区2套三类储集体的分布和储集体之间的差异。通过对奥陶系油气的分布和碳酸盐岩内特殊的流体赋存状态的分析,认为轮南地区奥陶系油气分布整体上受储集体发育控制,同时不同类型储集体及其隔离、封存油(气)或水的差异是平面上油气分布规律性存在差异的重要原因。

A DISCUSSION ON THE OIL CONTROLLING MECHANISMS OF CARBONATE ROCK RESERVOIRS OF ORDOVICIAN IN LUNNAN AREA, TARIM BASIN

The carbonate rocks of Ordovician in Lunnan area are generally not reservoirs,but the deuterogenous karstificated holes,pores and seams can serve as valid reservoirs.On the base of analyzing the controlling factors of the development of karsts and the stages of karstification,the distribution of two series of three types reservoirs of Ordovician in Lunnan area was studied,and the differences between them were also discussed by the authors.Through analyzing the distributing rules of the oil and gas reservoirs of Ordovician and the special occurring state of the liquids in the carbonate rocks,it is believed that the distribution of the oil and gas in Ordovician in Lunnan area is generally controlled by the development of the reservoirs,and the distinct regional distributing rules of the oil and gas are mainly caused by the varying insulated and closed oil(gas) or water in different types of reservoirs.