摘要
大牛地气田是位于鄂尔多斯盆地北部的一个大型致密-低渗透气田。主要含气层位自下而上为上石炭统太原组、下二叠统山西组和下石盒子组,是一套完整的海相潮坪-近海三角洲-陆相辨状河沉积层序,厚度250-280 m,横向稳定,宏观形态呈一巨大的“箱型”,受上石盒子组区域盖层物性和异常压力的双重封盖作用,工业气藏的发育被严格限制在该箱体内,多层大型岩性圈闭叠合发育,具有“近源箱型”成藏模式。针对岩性圈闭、致密-低渗透砂岩储层、自然产能低等难点,在气田的勘探开发中,形成了叠合岩性圈闭描述与评价、煤系地层地震储层预测等关键技术,并建立了以保护气层为重点的快速钻井综合技术、以提高产能为核心的致密气层大规模压裂改造技术等配套技术体系。
The giant Daniudi gas field, located in the north of Ordos basin, is of a tight and low-permeability type. Its main gas-bearing horizons from bottom to top are the Taiyuan Formation of the Upper Carboniferous and Shanxi Formation and lower Shihezi Formation of the Lwer Permian, forming a complete set of sedimentary sequences of marine tidal flat-paralic-deha-terrestrial braided channel. The sequences, with a thickness of 250 m to 280 m and a stable lateral distribution, are in a shape of a huge box, to which the commercial gas pools are confined due to a dual tight sealing of favorable lithophysics and anomalous pressure of the regional cap in the upper Shihezi Formation. Layered lithologic traps overlap with one another and hydrocarbon reservoiring in them is characterized by near-source and box-like traps. To solve the problems caused by lithologic trap, tight and low-permeability sand reservoirs, and low natural production of the field, core technologies, such as description and evaluation of stacked lithologic traps and seismic prediction of coal bed reservoirs, have been developed during the exploration and development of the Daniudi gas field. And corresponding technologies of quick drilling aiming at protecting gas reservoirs and large-scale fracturing intending to promote gas production of tight reservoirs have also been advanced.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2006年第6期762-768,共7页
Oil & Gas Geology
关键词
致密储层
岩性圈闭
近源箱型成藏模式
储层预测
大规模压裂
大牛地气田
Daniudi gas field
near-source box-type reservoiring mode
tight reservoir
lithologic trap
reservoir prediction
large-scale fracturing
