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Development Strategy Optimization and Application for Fractured-Vuggy Carbonate Gas Condensate Reservoirs

机译：裂缝 - Vuggy碳酸盐气凝胶储层的开发战略优化与应用

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Naturally fractured-vuggy carbonate gas condensate reservoirs in China have some distinctive characteristics: deep buried depth, multi-scale fractures, vugs and caves developed, poor reservoir connectivity, high production decline rate and low estimated ultimate recovery. So how to properly develop this kind of reservoirs is a major challenge. This paper presents the study on development strategy optimization for fractured-vuggy carbonate gas condensate reservoirs in detail. Based on the geological survey of palaeokarst outcrops and seismic interpretation, representative reservoir type patterns of fractured-vuggy carbonate gas condensate reservoirs can be determined. And combined geological study and dynamic characterization, different reservoir patterns can be identified and characterized. After that, simulation models of different reservoir patterns are built, in order to study the detailed development strategy on primary depletion and water flooding huff-and-puff. And optimal development strategies are applied into the TZ fractured-vuggy carbonate gas condensate reservoir in China. Take TZ carbonate gas condensate reservoir in China for example. The mid-depth of TZ reservoir is 5500m with annual production decline rate higher than 25%. Through geological and dynamic characterization, six representative reservoir type patterns are identified and characterized. And more than half drilled patterns in TZ are isolated and developed in very limited volume, which only need one well to develop each pattern. Then reservoir simulation models of the six patterns are built to investigate the optimized development strategies. The results show vertical wells are optimum for four patterns and horizontal wells are optimum for two patterns. For isolated karst caves pattern, there are still lots of remaining condensate oil after primary depletion, so water injection huff-and-puff are studied for this pattern. The results are applied to TZ reservoir. This paper offers a case study on development strategy optimization of different reservoir patterns for fractured-caved gas condensate carbonate reservoirs, and the understandings are successfully applied to TZ carbonate gas condensate reservoir. It also provides a methodology and an improved oil recovery reference case for engineers and geologists to develop other similar reservoirs.
机译：天然骨折 - Vuggy碳酸盐碳酸盐储存水凝块在中国具有一些独特的特点：深埋深度，多尺度骨折，Vugs和洞穴开发，储层连通性差，产量低，估计终极恢复低。所以如何正确发展这种水库是一个重大挑战。本文详细介绍了骨折 - Vuggy碳酸盐气体冷凝水储层的发展战略优化研究。基于Palaeokarst露头的地质调查和地震解释，可以确定裂缝 - 沃谷岩石碳酸盐气体冷凝水储层的代表性储层型图案。并组合地质研究和动态特征，可以识别和表征不同的储层图案。之后，建立了不同储层模式的仿真模型，以研究初级耗尽和水淹水和泡芙的详细发展战略。最佳发展策略应用于中国的TZ骨折碳酸盐碳酸盐液凝结水库。例如，在中国服用TZ碳酸盐液凝结水库。 TZ水库的中间深度为5500米，年产量下降率高于25％。通过地质和动态表征，鉴定并表征了六种代表性储层型模式。在TZ中出现超过半钻的图案，在非常有限的体积中被隔离并开发，这只需要一个井开发每个图案。然后建立六种模式的储层模拟模型，以调查优化的开发策略。结果显示垂直孔对于四个图案和水平井是最佳的两个模式的最佳选择。对于孤立的喀斯特洞穴模式，初级耗尽后仍有许多剩余的凝析油，因此研究了这种图案的注水Huff-and-buff。结果适用于TZ储层。本文提供了对骨折塌陷气体缩合碳酸盐储层的不同储层模式的开发战略优化案例研究，并成功地应用于TZ碳酸盐气体冷凝水储层。它还为工程师和地质学家提供了一种方法和改善的石油回收参考案例，以开发其他类似的水库。

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