Study On Resources Potentiality Of Petroleum In Wuerxun-Beier Depression

Hailaer basin in the prospecting area of Daqing oil field , as the one of most petroliferous basin in newly developed area , is widely concerned by explorationist and trade continuously these years . Wuerxun depression and beier depression , as two main depression in basin , the degree of prospecting is upper , oil and gas that has been detected is more , and the resources potentiality is enormous .Based on the feature of water environment in the locality , and take all of the geologic feature into consideration , and ascertain that the depositional environment of source rock in intrinsic region be characterized by fresh water-brackish deposit environment , and the evaluation criteria that fit to the evaluation of the source rock in intrinsic region is also established .On the basis of the holding about integral feature of source rock in intrinsic region , following realization were gotten : the rock type of source rock in intrinsic region is far more , the component that bore hydrocarbon is far more . the difference in abundance and type of source rock is large , the capacity variance in boreing hydrocarbon of source rock in difference section is large .In allusion to the geollgical features of the continental facies faulted basin that is complicated and multivariant in intrinsic region , the computational model that apply well-log information to appraise hydrocarbon source rock is established , the effect is preferably through the application in practice . And combine with the material both geophysical prospecting and sequence analysis , the conclusion is that the collapsing and the transform interface of sequence control the growth of hydrocarbon source rock .About the comparative study of oil sources in main area , the information of hydrocarbon source rock is inverted in accordance with the geochemical characteristic of the crude oil . The preliminary study about the source of oil and gas in intrinsic region thought that : the crude oil in Bayantala division mightbe originstem from Nantun formation and Tongbomiao formation of intrinsic region chiefly , the crude oil from the structural slopethe belt in the southern of Wuerxun depression appear as compound source from the first section of Damoguaihe formation , Nantun formation and Tongbomiao formation , and the crude oil from the structure core of the southern in Wuerxun depression might main stem from Nantun formation and Tongbomiao formation .On the basis of the study and simulation in nowadays thermal evolution and thermal evolution history , three types of hydrocarbon source rock thermal evolution were summarized . and on the basis of the study in the amount of denudation and the other elements of source rock , the distribution graph of hydrocarbon source oven was gotten .Comprehensive consider about the distribution of sedimentary facies , buried depth of structure , layer thickness and the ratio of sand and layer , and combine with the source rock thickness of single-well extrapolated in plane , the distributional characteristics ( include the thickness of source rock , the abundance of organic matter and the type of organic matter ) of source rock was gotten .Integrated with all of above study , through simulation in the generatation of hydrocarbon , oil generating amount , gas generating amount and the total hydrocarbon generating amount was forecasted .