再论网络状油气藏与轮南潜山勘探对策

网络状油气藏外部宏观形态似层状或块状油气藏 ,但其油气实际聚集于被断裂、裂缝所连通的孔、洞 (多为溶蚀形成 )构成的储集空间系统中 ,因而具有超强的非均质性。塔里木盆地塔北隆起的轮南潜山即属于网络状油气藏发育区 ,用对网络状油气藏的认识分析该区已获勘探成果 ,依据成藏条件、烃类流体性质 ,可以划分出 5个油气富集区 ,其储量总规模为 5× 10 8～ 8× 10 8t ,近期找到 5个亿吨级油气田的前景明朗。在网络状油气藏和油气富集区带内都可能出现低产井甚至水井、干井 ,不要因此而轻易否定其油气资源潜力 ,放弃勘探。由于网络状含油气体极易在钻井过程中被污染 ,因此应采用近平衡—欠平衡钻井技术 ,用尽可能短的时间打开目的层 ,避免固井时堵塞储集空间 ,最好裸眼完井 ,最大限度降低测井、测试对产层的伤害 ,并应通过大型酸化、压裂改造产层 ,以获得高产稳产。图 4表 5参 4(周兴熙摘 )

My second discussion on network-like oil and gas pools and the exploration strategy for Lunnan buried-hill pools

The external shape of the network like pools looks like that of stratified or massive oil and gas pools, but actually, their petroleum accumulated in reservoir space system which is composed by pores and caves (solution pores and caves mainly) connected by faults and fractures. So, these pools are very heterogeneous. The Lunnan buried hill pool is located in the development region of network like oil and gas pools. This development region can be divided into 5 oil and gas abundance zones based on the forming conditions of pools and the property characters of the hydrocarbon fluids, from where 5 oil and gas fields with a total OOIP of 500 to 800 million tons are prospectively discovered in the near future. Within the network like pools or oil and gas aboundance zones, there maybe appear some stripper oil wells or even water wells or dry wells, but this dose not mean that the resources potential is negnigible and the exploration should be stopped. Due to these pools are easy to be damaged during drilling, a set of special technology should be adopted, such as near balanced and under balanced drilling, open hole completion, maximumly preventing damage from well logging and testing, massive acidization and fracturing, in order to reach a high and stable oil production.