摘要
LD15－1构造位于莺歌海盆地中部坳陷，是由泥底辟引起顶部地层向上拱曲而形成的背斜构造。天然气产自莺黄组中、上部砂岩中。粒间原生孔和粒间溶蚀扩大孔是砂岩中极其重要的储集空间。砂岩的成岩作用主要包括压实作用、胶结作用和溶蚀作用。研究表明，莺黄组地层所经受的成岩作用阶段为早成岩阶段及晚成岩阶段A－B期。溶蚀作用对砂岩成为高孔中渗储层贡献较大。深海盆地水道浊积砂、浅海陆架席状砂是良好的储集砂体。巨厚的烃源岩和良好的储集砂体及其与完整圈 闭的有机组合，是莺歌海盆地天然气富集的基本因素。
LD 15-1 prospect is located in the central depression of Yinggehai basin, which is an anticlinal structure formed by the arching of underlain mud diapir. The middle and upper sandstones in Ying-Huang formation are the gas payzones. Primary inter-granular pores and the enhanced inter-granular dissolution pores are reorganised as the most important pore spaces. Sandstone diagenesis mainly includes compaction, cementation and dissolution. Ying-Huang formation was mainly experienced early diagenesis and A-B stages of late diagenesis. The reservoirs with high porosity and medium permeability were mainly contributed by dissolution. The turbidite sandstones of abysmal channels and sheet sandstones on shallow continental shelf are considered as better reservoirs. Basic factors for enriched natural gas accumulations in Yinggehai basin are massive thickness of source rocks, good reservoir sands and intact traps.
出处
《中国海上油气（地质）》
CAS
1995年第5期307-312,共6页
China Offshore Oil and Gas(Geology)
