“源-盖”联控成藏模式在番禺4洼的实践

Practice of "source rock-cap rock" joint-controlling hydrocarbon accumulation model in Panyu 4 Sag

根据番禺4洼油气勘探成果及成藏特点,提出了"源-盖"联控成藏模式。"源-盖"联控成藏模式反映了烃源岩的倾向和区域盖层的空间配置、叠合关系对油气的平面运聚和空间分配起着重要的控制作用,认为烃源岩和区域泥岩盖层的抬升方向即为油气运移的有利方向。番禺4洼文昌组烃源岩抬升倾向具有明显的分带性:在洼陷南部主要往西抬升,北部主要往东抬升,另一方面区域海泛泥岩抬升倾向与烃源岩较为一致。在此成藏规律指导下,钻探了PY10-A和PY10-B构造,均取得商业成功,进一步证实了"源-盖"联控成藏模式在番禺4洼勘探中的正确性和可行性,对于深化番禺4洼油气成藏认识和下一步寻找有利勘探目标都具有十分重要的意义。

Based on the results and characteristics of oil and gas exploration in Panyu 4 Sag, a new hydrocarbon accumulation model is proposed which is called ＂source rock-cap rock＂ joint-controlling model. The joint-eontrolling model shows that the dimensional allocation and superimposed relationship between souree rock trend and regional cap rock play a very important controlling role on the planar migration, accumulation and dimensional distribution. It is considered that the uplift trend of source rock and cap rock is the favorable direction of hydrocarbon migration. The uplift trend of Wenchang Formation source rock has obvious zonality： in the southern part of sag, it uplifts to the west; in the northern part, it mainly uplifts to the east. And in addition, the uplift trend of regional flooding mudstone is consistent with that of hydrocarbon source rock. According to this hydrocarbon accumulation model, PY 10-A and PY 10-B structures are drilled with commercial discoveries, which also proves the validity and feasibility of source rock- cap rock＂ joint-controlling model in exploration of Panyu 4 Sag, and has significant value for understanding the hydrocarbon migration and looking for favorable exploration targets in Panyu 4 Sag.