The Source Kitchen Preferred And Favorable Exploration Forecast Of C6-C8in Zhenbei-Huanxian

Ordos Basin’Zhenbei-Huanxian area is an important oil and gas exploration areas in the southern Tianhuan Depression basin. This paper based on the material basis of the oil generation, the same time combined with geochemical experimental data^Logging data and geophysical logging data single well data for research. This article started off from the work area oil source material basis of the combination of experimental data, geophysical logging data, logging, single well data, take full advantage of Alg R (passey,1990) and Ro inversion technology, combined with the thickness of hydrocarbon source rocks to evaluate the source kitchen in the work area, Pointed out that the favorable potential of hydrocarbon area, to guide the exploration of oil and gas. By studying the characteristics of the source rocks,to achieve results is as follows:(1) First, the integrated use of geological, logging and localized information, research hydrocarbon source basic parameters characteristic of Triassic C7-1, C7-2, C7-3, C9-1in Zhenbei-Huanxian, On the basis of hydrocarbon source rock geochemical parameters evaluation data, understanding and evaluation of hydrocarbon source rocks preliminary of Yanchang group C7-1, C7-2, C7-3, C9-1one by one. Limited drilling coring data(Such as the measured data point values rarely of C9-1in work area), on the one side, the high cost of laboratory analysis such as few workers which caused a comprehensive understanding source rocks of C7-1, C7-2, C7-3and C9-1.(2) The use of the characteristics that the dark high impedance shale source rocks on logs response, in order to read the thickness of mudstone finally of C7, C9. The thickness of the hydrocarb source rock planar graph on C7-1, C7-2,C7-3, C9-1was thin west thick east trend.(3) Preferably by calculating the contrast utilization passey (1990) the inversion TOC of Alg R technology, in order to make planar graphs.①The whole C9-1TOC is greater than0.5%, the entire source rocks with hydrocarbon potential distribution trend lower in the west East zonal distribution to Central County-Tiger the hole enbu three cellar-Wu ditch-Little Bay-Village Creek-thrall line TOC value of1.0%, the abundance of organic matter.②organic matter abundance of C7-3TOC values of up to20%, the highest abundance in the work area target layer source rocks, hydrocarbon potential.③The organic matter (TOC) abundance of C7-2distribution in graph trend from west to east-a growing trend from south to north, the area in Central counties of up to9%of the highest value.④the C7-1entire hydrocarbon source rock has reached the lower limit of the hydrocarbon abundance, northeastern Hop Road-wooden bowl area.(4) According to the relational model to establish the relationship between depth and Ro, the work area is subdivided into three area are ZhenBei area,Huanxian area and West Wing-south section. Due to thermal anomaly and the Structure of Stratum,there is heterogeneity between Ro and depth.Calculate Ro and planar mapping. Workers Chang7,9hydrocarbon source rocks and high maturity, Ro plane was low in the west-east zonal distribution trends, two sets of source rocks in the hydrocarbon phase, and the vast majority of the work area is greater than0.75%Ro entered into hydrocarbon peak period.(5)The actual work area source rocks in background combined with Previous studies of hydrocarbon source rock evaluation criteria, in order to formulated the new standard of the source kitchen for Zhenbei-Huanxian. Described the work area maturity By TOC calculated, the source kitchen evaluation parameters Ro is divided into two parts,0.5%<Ro<0.75%(which is the primary stage of oil generation) and0.75%<Ro<1.3%(which is the peak period of oil generation stage of organic matter’ maturity); parameter evaluation criteria to0.5%to1.0%in the abundance of hydrocarbon source rock area,1.0%to4.0%in the high abundance of hydrocarbon source rock area greater than4.0%of the high abundance of hydrocarbon source rock area divided; thickness of the hydrocarbon source rock to5m-10m line as the partition boundaries, and ultimately rock pod is divided into three evaluation areas. Each source rocks TOC maps, Ro’s maps and hydrocarbon source rock thickness distribution map superimposed. Plane distribution map, combined with the source kitchen comprehensive evaluation work, Mayor C7, C9the source kitchen evolutionary trends.(6) comprehensive analysis of the work area accumulation conditions (1),C9-1overpressure development and development of hydrocarbon source rocks, into the overall good physical properties and performance in high abundance, type, high maturity, and most parts of Ro greater than0.75oil generation peak.②In C8layer,the low pressure sand or atmospheric pressure development, thickness, extensive coverage, and C8as the dissolution pore development, rock, dense, C7, C9direct contact, work area with excellent reservoir forming conditions.(7) through the distribution of the the source kitchen and work area pilot oil-water pillars Figure Composite analysis of raw the source kitchen reservoir relationship, the judgment favorable oil generation zone with a distribution range. Concluded that C6-C8layer reservoir the source kitchen control reservoir formed by the the source kitchen abundance of thermal evolution and distribution trend factors in Zhenbei-huanxian. And pointed out that the Town-Central County area reservoir distribution kindred dominant gathered characteristics specified area should be based on the main Triassic C7-3in the Central Huanxian-Mubo area and the original Zhenyuan-Taiping region favorable exploration targets in the exploration of new ideas.