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題名 | 鐵砧山氣田立體儲集層特性研究=Reservoir Characterization Research of Tiehchenshan Gas Field, Miaoli, Taiwan |
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作者姓名(中文) | 周學良; | 書刊名 | 探採研究彙報 |
卷期 | 20 1997.11[民86.11] |
頁次 | 頁395-406 |
分類號 | 457.2 |
關鍵詞 | 鐵砧山氣田; 儲集層電腦立體模型; 自然電位差; 近似頁岩含量; 併購礦區油藏評估; 地層封閉油氣探勘; Tiehchenshan gas field; 3D reservoir model; Spontaneous potential; Approximate shale contain; Reservoir evaluation; Exploration of stratigraphic traps; Farm-in; |
語文 | 中文(Chinese) |
中文摘要 | 本研究將鐵砧山氣田TT-1A 層、TT-1A'層和TT-1B層三個頂部構造圖以 QUIKDIG軟體和MIMIC 軟體轉成三維層面檔及三維斷層檔。並輸入SGM軟體中以建 立儲集層立體模型之架構。再將本區十八口井之自然電位差電測圖中之SP曲線及頁岩基 線以QUIKLOG軟體轉成電腦檔,經過運算後即可求得近似頁岩含量,再輸入上述模型 架構中,建立鐵砧山氣田儲集層立體模型。 為了瞭解此儲集層之特性,將此儲集層立體模型切了六個東西向的自然電位差立體 剖面。近似頁岩含量方面切了六個東西向立體剖面、三個西北-東南向剖面、南北向立體 剖面及柵狀圖等。 此立體儲集層模型之精度很高,可描述薄至一米之地層屬性,對儲集層可作詳盡之 剖析。此項新技術可用於:1.併購礦區時之油藏評估,2.礦區之開發、生產,3.地層封 閉之油氣探勘。 |
英文摘要 | This study combined the geologic analysis data from well logging, seismic data and geochemical analysis data to figure out the structure type, seismic sequence and basin evolution of the Pre-Miocene strata in the CDA and CDC blocks of Taihsi Basin offshore Taiwan. The study also input efforts into understanding the seismic facies and the paleo-environment. This alone with the geochemical analysis, consequently enables the discussion of the hydrocarbon potential both in quantity and quality of the Pre- Micocene strata in the area. The results will then provide important information to the exploration on the area. Five seismic sequences (E1 ∼ E5) and six interfacial layers were defined in the Pre-Miocene strata of the area through the integration and interpretation on the rock analysis data and the seismic process data. By doing this, more understanding of the basin evolution can be gained and the knowledge can subsequently be applied on the hydrocarbon potential evaluation. As far as the structural analysis is concerned, the CDA block is, in general, formed by two sets of normal faults, striking NEE-SWW and NEN-SWS respectively, and exhibits a rhombus trough. The displacement of the fault was estimated and is gradually decreasing from the south-west end towards the north-east and then increasing again, indicating that the two sets of normal faults formed two minor troughs, developed at the same period, and crossed over in the early stage. The normal faulting activities mostly concentrated on the set of faults trending north-north-east to south-south-west, resulting in thick layers of sediment. When the faulting was about to stop, the subsiding mechanism took place and continued to develop, heading to the north-west direction. According to the basin rifting analysis, the rift of the earth crust in the CDA area is not entirely caused by the spinning of the fault blcks resulted from the normal faulting activities. The subsidence that occurred at the late stage of the rifting period indicates that there might be another ritfing period indicates that there might be another rifting prior to the normal faulting activies in this area. Having thoroughly examined the cores recovered from CDA-1, CDA-5 and CDC-2 wells, it has been found that the paleo-environment varies considerably within the Pre-Miocene strata. In addition to lacustrine facies, which forms the main part of the sedimentary system, marine facies and shoreline facies were also recognized. From the geochemical analysis data, the best source rock is in the E3 sequence strata. The organic richness index of E3 sequence except the part at the top of E3 near the unconformity where the grade of organic richness is "poor" exhibits the grade of "good" or "excellent" and falls in the "oil window" range, which generate mainly oil with some gas. The best source rocks of this area have been indentified on the seismic section diagram with the depth, location and marked extent, which is helpful to calculate the amount of oil and gas generation and to estimate the total reserve. The structures and the strata form the primary trapping system for oil and gas accumulation in the CDA block. High relief of the paleo-landscape caused significant variety in characteristics of reservoir rock, which are lack of continuity. The shape of structures is not always conformable with the shape of the interfacial unconformity between two sequences. Therefore, to figure out the structures and distribution of reservoir rocks in each individual sequence appears to be more important when exploring on the basin. E3-2, with a depth ranging from 3515 to 3533 m where heavy oil was recovered from CDA-3 well is a sandstone structure-stratigraphy trap, exists in the E3 sequence. The structural high is about 3 Km to the south of the CDA-3 well. The area of the trap is about 3 Km ��. E3-4 is also a structure-stratigraphy trap with an area of about 6 Km ��.The E4-1 is a structure-stratigrphy trap in the E4 sequence and has an area of about 6 Km ��. Generally speaking, the CDA block of Pre-Miocene strata is the area with the best hydrocarbon potential in the offshore Taihsi. The Original Oil In Place (OOIP) is estimated by using the two way travel time thickness of 300 msec for the carefully selected good source rocks and 1000,000 barrels of oil in the E3 sequence was estimated. Also, the hydrocarbon potential of the structure-stratigraphy trap in the south should not be ignored. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。