The Seismic Interpretation for (X) Oil Field Depending on 3D Seismic Data of Nearby Oil Field, Southern Iraq

This research focused on using seismic data to review the structure of the (X) Oil Field, located 40 km SW of Basrah, Southern Iraq. The study utilises a 3D seismic survey conducted during 2011-2012, covering the (Y) Oil Field 2 km to the west, and with partial coverage across (X), to map the Top Zubair reflector. Seismic rock properties analysis was conducted on key (X) Oil Field wells and used to tie the Top Zubair reflector on (X) Oil Field. The reflector was mapped within the time domain using DecisionSpace Software, and then converted to depth using a velocity model. The depth structure map was then compared to the original oil water contact (OOWC) across the fields to understand the potential structural closure of the Top Zubair reservoir in both fields.

3-D Seismic Structural Interpretation of High Field Offshore Western Niger Delta

Seismic Structural interpretation of subsurface system is a vital tool in mapping source rocks and good trapping system which enhances good understanding of the subsurface system for productive drilling operation. This study is geared towards mapping the structural traps available within the hydrocarbon bearing zones of the “High field” with the use of well log and 3D seismic data. Seven horizons (H1, H2, H3, H4, H5, H6 and H7) were identified on well logs using gamma ray log and resistivity logs. Nine (9) faults were mapped on seismic sections across the field, two (2) of which are major growth faults (F1 and F2), two (2) synthetic faults (F3 and F7) and five (5) antithetic faults (F4, F5, F6, F8 and F9). Rollover anticlines which are structural closure and displayed on the depth structural maps suggest probable hydrocarbon accumulation at the down throw side of the fault F1. Structural interpretation of high field has revealed a highly fault assisted reservoir which depicts the tectonic setting of Niger Delta basin.

2D Seismic Reflection Study of the Cretaceous-Tertiary Period in Qasab-Jawan Area in Northwestern Iraq

A seismic study was conducted to re-interpret the Qasab and Jawan oil field in northern Iraq, south of the city of Mosul, by reprocessing and interpreting many seismic sections of a number of field surveys that included the field area. Two reflectors are detected, represented by Hartha Formations which were deposited during the Cretaceous age and Euphrates Formation which was deposited during the Tertiary age in order to stabilize the structural image of this field. The study was achieved by reinterpreting seismic sections using the Petrel program, where time, velocity and depth maps were prepared for the two formations. The study showed that the Qasab and Jawan fields generally consist of a structural closure located at the wells of the northern dome. This closure extends to the south east and deviates towards the east in the form of a structural rift. The study concluded the existence of a transverse fault that cuts Qasab and Jawan structures, forming a structural trap that represents the southern part of Qasab structure.

Reservoir modeling and petrophysical evaluation of kanga field onshore Niger delta.

Reservoir sands from seven wells in Kanga Field in the Onshore Niger Delta was subjected to both petrophysical evaluation and reservoir modeling. Methodologies used are standard methods used in reservoir modeling and petrophysical evaluation. Results from reservoir modeling, shows that six synthetics and four antithetic faults have been identified and these faults are the main structural closure for hydrocarbon accumulation in Kanga Field. Petrophysical analysis showed porosity ranging from (25-27%), (16-27%) and (11-17%) for J100, K100 and L100 respectively. Modeled porosity showed high porosity in J100 and the central part of K100 reservoir. While, low porosity/; is recorded in L100. Water saturation ranges from 20 to 90% in the J100 reservoir, the lowest water saturation value was at the NE, NW and central part of the reservoir. Oil water contact reveals pockets of hydrocarbon in J100 and L100 reservoir. The bulk volume of hydrocarbon saturation closure is (21,954.37) arceft, (209,613.7) acreft and 46,025.51) acreft for J100, K100, and L100 reservoirs respectively. The estimated volumetric for P90 are (4,648,755.06) STB, (16,545,452.38) STB and (9,976,551.38) STB respectively. This study de that the field is viable for hydrocarbon exploration.

The Blane Field, Block 30/3a, UK North Sea

The Blane Field is located in the central North Sea in Block 30/3a (Licence P.111), approximately 130 km SE of the Forties Field, in a water depth of 75 m (246 ft). It straddles the UK/Norway median line with 82% of the field in the UK and 18% in Norway. Blane produces undersaturated oil from the Upper Forties Sandstone Member of the Sele Formation and contains good quality light oil within a four-way structural closure; it has a hydrodynamically tilted original oil–water contact. The field stock-tank oil initially in place estimate is 93 MMbbl with an expected ultimate recovery of 33 MMbbl. Blane first oil was achieved in September 2007. The field has been developed by two horizontal producers located on the central crest of the field supported by a water injector drilled on the NW flank. Oil production peaked at c. 17 000 bopd in 2007 and the field is currently in decline. By the end of 2018 production was c. 3000 bopd with 55% water-cut. Cumulative oil production to the end of 2018 was 26.6 MMbbl.

Play with Closing Markers: Cadential Multivalence in 1960s Prechoruses and Related Schemas

In 1960s pop/rock, the end of a prechorus often uses text, breakaway from harmonic loops, hypermeter, or a change of melody to heighten expectation for tonic harmony and create structural closure. Songs harness this heightened expectation to underscore the importance of the chorus and illustrate the singer’s lyrics. These closing markers provide a wide range of expressive and formal options by creating various cadential effects, including a closed cadence overlapping with the chorus, an open cadence before the chorus, or—in passages often depicting marked emotional states—conflicting formal cues.

Take Back Our Future

This book unveils the causes, processes, and implications of the 2014 seventy-nine-day occupation movement in Hong Kong known as the Umbrella Movement. The chapters ask, how and why had a world financial center known for its free-wheeling capitalism transformed into a hotbed of mass defiance and civic disobedience? The book argues that the Umbrella Movement was a response to China's internal colonization strategies—political disenfranchisement, economic subsumption, and identity reengineering—in post-handover Hong Kong. The chapters outline how this historic and transformative movement formulated new cultural categories and narratives, fueled the formation and expansion of civil society organizations and networks both for and against the regime, and spurred the regime's turn to repression and structural closure of dissent. Although the Umbrella Movement was fraught with internal tensions, the book demonstrates that the movement politicized a whole generation of people who had no prior experience in politics, fashioned new subjects and identities, and awakened popular consciousness.

ESTIMATION OF STRUCTURAL IMAGING UNCERTAINTYSPATIAL DISTRIBUTION

In this work a method is proposed for estimation of spatial distribution of predicted structural uncertainty.This estimation is made by a deterministic way during the analysis of internal convergence of the seismic method data. The errors in determination of kinematic parameters, namely time and velocity, are estimated. The estimates of external convergence of seismic data with drilling data are taken into account. As a result, a map of standard deviation of structural imaging is calculated which then is used to construct a map of a structural closure probability (risk).

From play to production: the Cooper unconventional story—20 years in the making

The Cooper Basin is Australia’s leading onshore producing hydrocarbon province, having produced more than 6 Tcf of natural gas since 1969. The basin is undergoing renewal 45 years later, driven by the emerging growth of east coast LNG export-driven demand. Following North America’s shale gas revolution, the Cooper Basin’s unconventional potential is now widely appreciated and it is believed to hold more than 100 Tcf of recoverable gas. This resource potential is held in four stacked target unconventional lithotypes, each having demonstrated gas flows: tight sands—heterogeneous stacked fluvial sands; deep coal—porous dry coals, oversaturated with gas; shales—thick, regionally extensive lacustrine shales; and, hybrid shales—mixed lithotype containing interbedded tight sandstones, shales and coals. Industry activity initially focused on the Nappamerri Trough, where more than 25 contemporary exploration wells have been drilled, proving up an extensive basin-centred gas play with >1,000 m of continuous overpressured gas saturated section outside of structural closure. Santos has had a team focused on unconventional resources for nearly 20 years and successful results have been quickly tied into the producing infrastructure. This has been demonstrated with the Moomba–191 REM shale success, Moomba–194 and the recent Moomba–193H connection, one of the basin’s first fracture-stimulated horizontal wells. Prospective geology, existing infrastructure and market access makes the Cooper Basin well positioned for unconventional success. Each resource play is unique and commercial success requires considered adaptation of established technologies and workflows, based on a understanding of local geological and reservoir conditions. Commercialisation activity now seeks to define play fairways, characterise and prioritise reservoir targets and determine appropriate drilling and completion approaches.

Performing Expressive Closure in Structurally Open Contexts: Chopin’s Prelude in A minor and the Last Two Dances of Schumann’sDavidsbündlertänze

Schenkerian analysis gives priority to structural harmonic and voice-leading closure in tonal works, but composers have found other ways to simulate (and dissimulate) structural closure for dramatically expressive purposes. After a brief look at an example by Beethoven (the coda to the first movement of op. 2, no. 1), I focus on interpreting closure in two Romantic piano pieces. In his Prelude in A minor, op. 28, no. 2, Chopin plays with three different closural gambits: dissolution to silence, a false Picardy third close on the dominant, and a final V7–i cadence in A minor. The latter two options are also marked by shifts in level of discourse, and may suggest two commentaries (beatific consolation vs. tragic desolation) on the funereal trajectory of the work. In the penultimate dance of hisDavidsbündlertänzeop. 6, Schumann achieves both thematic and tonal closure, complete with the cyclic return of waltz no. 2 and a passionately tragic coda suggestive of Florestan. But he expressively undercuts that strong closure to allow Eusebius the last word. The final waltz (no. 18) overflows not only its own formal boundaries, but also the formal closure of the set implied by no. 17, reversing the tragic coda to achieve a transcendently positive epiphany. I propose and illustrate performance options that can help project the expressive closural dramas in these two works by Chopin and Schumann.