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Pinedale Anticline, A Giant New Gas Resource in the Rockies: Introduction and Overview

机译：派恩代尔背斜，落基山脉的巨大新天然气资源：简介和概述

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摘要

Recent surveys of unconventional natural gas have identified continuous, basin-centered gas systems as one of the most economically important resources in the world (Law, 2002). Such accumulations, in fact, have received much attention over the last few years, especially with regard to Laramide (Late Cretaceous-Early Tertiary) basins of the Rocky Mountain region. Accumulations identified as basin-centered gas now contribute roughly 15% of total U.S. natural gas production, with the great majority of this coming from basins in the Rockies. The main elements in a basin-centered gas system (BCGS), as described by Law and Dickinson (1985) and Spencer (1987), include the following: 1) a regionally pervasive accu-mulation (hundreds to possibly thousands of square miles) in low-permeability, gas-saturated reservoirs; 2) lack of a downdip water contact and any single, updip trapping mechanism; 3) presence of gas-prone source rocks proximal (e.g. interbedded with) to reservoirs; 4) possible presence of overpressure, due to more rapid generation of thermogenic gas than can escape from low-permeability reservoirs; 5) top of the accumulation coincides with narrow range of thermal maturity (e.g. vitrinite reflectance values between 0.75-0.9), below which reservoirs are gas saturated. As so defined, BCGS accumulations are highly layered, with gas confined to reservoir intervals over a very thick (up to 10,000 ft) interval.
机译：最近对非常规天然气的调查表明，以盆地为中心的连续天然气系统是世界上最重要的经济资源之一（Law，2002）。实际上，这种堆积在过去几年中受到了很多关注，特别是在落基山脉地区的拉里酰胺（晚白垩世-早第三纪）盆地方面。现在，以盆地为中心的天然气积累量约占美国天然气总产量的15％，其中绝大部分来自落基山脉盆地。如Law和Dickinson（1985）和Spencer（1987）所描述的，以盆地为中心的天然气系统（BCGS）的主要要素包括以下内容：1）区域性的普遍性积累（数百至数千平方英里）在低渗透，气体饱和的油藏中； 2）缺乏下倾水接触和任何单一的上倾陷阱机制； 3）在储层附近（例如与之交错）存在易生气的烃源岩; 4）由于产热气体的产生比从低渗透性储层中逸出的速度更快，可能存在超压； 5）储集层的顶部与热成熟度的窄范围相吻合（例如，镜质体反射率值在0.75-0.9之间），低于此范围则气藏处于饱和状态。按照这样的定义，BCGS堆积物是高度分层的，气体被限制在一个很厚（最高达10,000 ft）的储层中。

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