The Hydrocarbon Accumulation Mechanism Of Dabei-Kelasu Structural Zone In Kuqa Depression

In recent years, the Kuqa foreland thrust belt of hydrocarbon exploration continue to achieve new breakthroughs found in Kela 2 gas field and a series of important large hydrocarbon structures, so that the Kuqa foreland depression as key areas for gas exploration in the Tarim Basin. Reservoir on the formation of petroleum system, in particular, accumulation and accumulation history of the research, Zhao JingZhou, Zhang Nai, Qin ShengFei, Li HuiLi and so on to carry out a more comprehensive and systematic in-depth study. However, the DaBei hydrocarbon in Kuqa Depression of hydrocarbon accumulation and accumulation history of relatively weak light of this the thesis of DaBei-Kelasu petroleum systems of hydrocarbon accumulation and accumulation history in the Kuqa Depression, and then to study the mechanism for hydrocarbon accumulation belt.In research methods, as hydrocarbon accumulation of Kuqa petroleum system of the multi-phase nature and complexity, a single research method is sometimes difficult to make accurate judgments accumulation period, so this study used the method of hydrocarbon-generating history, fluid inclusions and other methods, combined with results of previous studies, cross-comparative analysis, in order of the Kuqa petroleum system, accumulation of a more detailed study. Space is limited, This article will discuss a few of the major methods of analysis to DaBei-Kelasu burial history of hydrocarbon systems, accumulation of research findings to be brief.DaBei-Kelasu petroleum system with multi-stage forming and multi-stage continuous accumulation characteristics of coal gas and the general characteristics of the same hydrocarbon. Organic inclusions showed the existence of 2 to 3 hydrocarbon charging, charging time period or part of the basic overlap:Stage I deposition of charging for the N1-2k of (11～5Ma), oil-based, color and type of inclusions to reflect the maturity of hydrocarbon is not high. Although the existence of Kela-2 gas pool in the inclusion of oil drilling also discovered a small amount of crude oil, but found that reservoir, may be a lot later into the dry gas, which makes the early accumulation of crude oil spill up along the fault, the ancient reservoir destruction of the western margin of Baicheng depression and charging time of the late N1-2k deposition.Stage II filling in the main hydrocarbon, oil and a small amount, N2k deposition of (5～3.5Ma), DaWan oil field as early as possible, formed in this period.Ⅲ, a gas filling is dominated by solid bitumen inclusions appear, indicating a high-mature gas filling time deposition, mainly in the late N2k-Q1x deposition of (since 3.5～IMa), also later in the eastern West. Kela-2 well, Kela-3 wells, Dabei-1 wells on the formation of the gas reservoirs are high-mature gas reservoirs.