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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。
The LD15-1 structure is located in the central depression of the Yinggehai basin, and is formed by the diapirism caused by the upward ditching of the top strata caused by mud diapirs. Natural gas produced in Yinghuang group, the upper sandstone. Intergranular primary pores and intergranular dissolution and expansion of pores is an extremely important sandstone reservoir space. Diagenesis of sandstone mainly includes compaction, cementation and dissolution. The study shows that the diagenesis stage experienced by the Yayhuang Formation is in the early diagenetic stage and the late diagenetic stage A-B stage. Dissolution has a great contribution to sandstone as a high porosity and permeability reservoir. Aqueduct of the deep-sea basin turbid sand, shallow shelf shelf sand is a good reservoir sand body. Thick source rocks and good reservoir sand bodies and their organic combination with complete traps are the basic factors for the enrichment of natural gas in Yinggehai Basin.